diff --git a/downloads-generation/models_class1_pan/GENERATE.sh b/downloads-generation/models_class1_pan/GENERATE.sh
deleted file mode 100755
index 23cc24f783b43fb476f36dac168a39d80c31348f..0000000000000000000000000000000000000000
--- a/downloads-generation/models_class1_pan/GENERATE.sh
+++ /dev/null
@@ -1,75 +0,0 @@
-#!/bin/bash
-#
-# Train pan-allele MHCflurry Class I models.
-#
-set -e
-set -x
-
-DOWNLOAD_NAME=models_class1_pan
-SCRATCH_DIR=${TMPDIR-/tmp}/mhcflurry-downloads-generation
-SCRIPT_ABSOLUTE_PATH="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/$(basename "${BASH_SOURCE[0]}")"
-SCRIPT_DIR=$(dirname "$SCRIPT_ABSOLUTE_PATH")
-
-mkdir -p "$SCRATCH_DIR"
-rm -rf "$SCRATCH_DIR/$DOWNLOAD_NAME"
-mkdir "$SCRATCH_DIR/$DOWNLOAD_NAME"
-
-# Send stdout and stderr to a logfile included with the archive.
-exec >  >(tee -ia "$SCRATCH_DIR/$DOWNLOAD_NAME/LOG.txt")
-exec 2> >(tee -ia "$SCRATCH_DIR/$DOWNLOAD_NAME/LOG.txt" >&2)
-
-# Log some environment info
-date
-pip freeze
-git status
-
-cd $SCRATCH_DIR/$DOWNLOAD_NAME
-
-mkdir models
-
-cp $SCRIPT_DIR/generate_hyperparameters.py .
-python generate_hyperparameters.py > hyperparameters.yaml
-
-cp $SCRIPT_DIR/write_validation_data.py .
-
-GPUS=$(nvidia-smi -L 2> /dev/null | wc -l) || GPUS=0
-echo "Detected GPUS: $GPUS"
-
-PROCESSORS=$(getconf _NPROCESSORS_ONLN)
-echo "Detected processors: $PROCESSORS"
-
-export PYTHONUNBUFFERED=1
-VERBOSITY=1
-
-mhcflurry-class1-train-pan-allele-models \
-    --data "$(mhcflurry-downloads path data_curated)/curated_training_data.with_mass_spec.csv.bz2" \
-    --allele-sequences "$(mhcflurry-downloads path allele_sequences)/allele_sequences.csv" \
-    --pretrain-data "$(mhcflurry-downloads path random_peptide_predictions)/predictions.csv.bz2" \
-    --held-out-measurements-per-allele-fraction-and-max 0.25 100 \
-    --ensemble-size 4 \
-    --hyperparameters hyperparameters.yaml \
-    --out-models-dir models-unselected.with_mass_spec \
-    --worker-log-dir "$SCRATCH_DIR/$DOWNLOAD_NAME" \
-    --verbosity $VERBOSITY \
-    --num-jobs $GPUS --max-tasks-per-worker 1 --gpus $GPUS --max-workers-per-gpu 1
-
-mhcflurry-class1-train-pan-allele-models \
-    --data "$(mhcflurry-downloads path data_curated)/curated_training_data.no_mass_spec.csv.bz2" \
-    --allele-sequences "$(mhcflurry-downloads path allele_sequences)/allele_sequences.csv" \
-    --pretrain-data "$(mhcflurry-downloads path random_peptide_predictions)/predictions.csv.bz2" \
-    --held-out-measurements-per-allele-fraction-and-max 0.25 100 \
-    --ensemble-size 4 \
-    --hyperparameters hyperparameters.yaml \
-    --out-models-dir models-unselected.no_mass_spec \
-    --worker-log-dir "$SCRATCH_DIR/$DOWNLOAD_NAME" \
-    --verbosity $VERBOSITY \
-    --num-jobs $GPUS --max-tasks-per-worker 1 --gpus $GPUS --max-workers-per-gpu 1
-
-cp $SCRIPT_ABSOLUTE_PATH .
-bzip2 LOG.txt
-for i in $(ls LOG-worker.*.txt) ; do bzip2 $i ; done
-tar -cjf "../${DOWNLOAD_NAME}.with_unselected.tar.bz2" *
-echo "Created archive: $SCRATCH_DIR/${DOWNLOAD_NAME}.with_unselected.tar.bz2"
-
-ls -d * | grep -v models-unselected | xargs -I {} tar -cjf "../${DOWNLOAD_NAME}.tar.bz2" {}
-echo "Created archive: $SCRATCH_DIR/${DOWNLOAD_NAME}.tar.bz2"
diff --git a/downloads-generation/models_class1_pan_unselected/GENERATE.sh b/downloads-generation/models_class1_pan_unselected/GENERATE.sh
new file mode 100755
index 0000000000000000000000000000000000000000..a805de9b58a2cc699623197f9bde152548c2c576
--- /dev/null
+++ b/downloads-generation/models_class1_pan_unselected/GENERATE.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+#
+# Train pan-allele MHCflurry Class I models.
+#
+set -e
+set -x
+
+DOWNLOAD_NAME=models_class1_pan_unselected
+SCRATCH_DIR=${TMPDIR-/tmp}/mhcflurry-downloads-generation
+SCRIPT_ABSOLUTE_PATH="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/$(basename "${BASH_SOURCE[0]}")"
+SCRIPT_DIR=$(dirname "$SCRIPT_ABSOLUTE_PATH")
+
+mkdir -p "$SCRATCH_DIR"
+rm -rf "$SCRATCH_DIR/$DOWNLOAD_NAME"
+mkdir "$SCRATCH_DIR/$DOWNLOAD_NAME"
+
+# Send stdout and stderr to a logfile included with the archive.
+exec >  >(tee -ia "$SCRATCH_DIR/$DOWNLOAD_NAME/LOG.txt")
+exec 2> >(tee -ia "$SCRATCH_DIR/$DOWNLOAD_NAME/LOG.txt" >&2)
+
+# Log some environment info
+date
+pip freeze
+git status
+
+cd $SCRATCH_DIR/$DOWNLOAD_NAME
+
+mkdir models
+
+cp $SCRIPT_DIR/generate_hyperparameters.py .
+python generate_hyperparameters.py > hyperparameters.yaml
+
+GPUS=$(nvidia-smi -L 2> /dev/null | wc -l) || GPUS=0
+echo "Detected GPUS: $GPUS"
+
+PROCESSORS=$(getconf _NPROCESSORS_ONLN)
+echo "Detected processors: $PROCESSORS"
+
+for kind in with_mass_spec no_mass_spec
+do
+    mhcflurry-class1-train-pan-allele-models \
+        --data "$(mhcflurry-downloads path data_curated)/curated_training_data.${kind}.csv.bz2" \
+        --allele-sequences "$(mhcflurry-downloads path allele_sequences)/allele_sequences.csv" \
+        --pretrain-data "$(mhcflurry-downloads path random_peptide_predictions)/predictions.csv.bz2" \
+        --held-out-measurements-per-allele-fraction-and-max 0.25 100 \
+        --ensemble-size 4 \
+        --hyperparameters hyperparameters.yaml \
+        --out-models-dir models.${kind} \
+        --worker-log-dir "$SCRATCH_DIR/$DOWNLOAD_NAME" \
+        --verbosity 0 \
+        --num-jobs $GPUS --max-tasks-per-worker 1 --gpus $GPUS --max-workers-per-gpu 1
+done
+
+cp $SCRIPT_ABSOLUTE_PATH .
+bzip2 LOG.txt
+for i in $(ls LOG-worker.*.txt) ; do bzip2 $i ; done
+tar -cjf "../${DOWNLOAD_NAME}.tar.bz2" *
+echo "Created archive: $SCRATCH_DIR/${DOWNLOAD_NAME}.tar.bz2"
diff --git a/downloads-generation/models_class1_pan/README.md b/downloads-generation/models_class1_pan_unselected/README.md
similarity index 100%
rename from downloads-generation/models_class1_pan/README.md
rename to downloads-generation/models_class1_pan_unselected/README.md
diff --git a/downloads-generation/models_class1_pan/generate_hyperparameters.py b/downloads-generation/models_class1_pan_unselected/generate_hyperparameters.py
similarity index 100%
rename from downloads-generation/models_class1_pan/generate_hyperparameters.py
rename to downloads-generation/models_class1_pan_unselected/generate_hyperparameters.py
diff --git a/downloads-generation/models_class1_pan/write_validation_data.py b/downloads-generation/models_class1_pan_unselected/write_validation_data.py
similarity index 100%
rename from downloads-generation/models_class1_pan/write_validation_data.py
rename to downloads-generation/models_class1_pan_unselected/write_validation_data.py
diff --git a/mhcflurry/select_pan_allele_models_command.py b/mhcflurry/select_pan_allele_models_command.py
index b7d2e5e32af896110f44b21d66f65c2037b6b996..eb3bca3df75e5cb18ab4a6d9528fd7d02647ce83 100644
--- a/mhcflurry/select_pan_allele_models_command.py
+++ b/mhcflurry/select_pan_allele_models_command.py
@@ -152,21 +152,21 @@ def run(argv=sys.argv[1:]):
     if num_folds <= 1:
         raise ValueError("Too few folds: ", num_folds)
 
-    #df = df.loc[
-    #    (df.peptide.str.len() >= min_peptide_length) &
-    #    (df.peptide.str.len() <= max_peptide_length)
-    #]
-    #print("Subselected to %d-%dmers: %s" % (
-    #    min_peptide_length, max_peptide_length, str(df.shape)))
+    df = df.loc[
+        (df.peptide.str.len() >= min_peptide_length) &
+        (df.peptide.str.len() <= max_peptide_length)
+    ]
+    print("Subselected to %d-%dmers: %s" % (
+        min_peptide_length, max_peptide_length, str(df.shape)))
 
     print("Num folds: ", num_folds, "fraction included:")
     print(df[fold_cols].mean())
 
     # Allele names in data are assumed to be already normalized.
-    #df = df.loc[df.allele.isin(alleles)].dropna()
-    #print("Subselected to supported alleles: %s" % str(df.shape))
+    df = df.loc[df.allele.isin(alleles)].dropna()
+    print("Subselected to supported alleles: %s" % str(df.shape))
 
-    #print("Selected %d alleles: %s" % (len(alleles), ' '.join(alleles)))
+    print("Selected %d alleles: %s" % (len(alleles), ' '.join(alleles)))
 
     metadata_dfs["model_selection_data"] = df