{
  "APL": "annotation_type APL",
  "APL_spiking_outgoing_weights": "frozen graded overlay zeros these; applied graded effect recorded separately",
  "DAN": "neurotransmitter dopamine (not inferred PAM/PPL1 name)",
  "KC": "annotation_class Kenyon_Cell",
  "MBON": "annotation_class MBON",
  "PN_olfactory": "annotation_class ALPN or olfactory",
  "other": "all remaining metadata classes; not an assertion of biological unknown"
}