Name	Type	Attributes	Definition
expression_id	string	required, identifier	"Identifier of this expression property measurement.
"
cell_id	string	required	"Identifier of the cell to which this expression data is related.
"
repertoire_id	string	required, nullable	Identifier for the associated repertoire in study metadata.
data_processing_id	string	required, nullable	Identifier of the data processing object in the repertoire metadata for this clone.
property_type	string	required	"Keyword describing the property type and detection method used to measure the property value. The following keywords are recommended, but custom property types are also valid: ""mrna_expression_by_read_count"", ""protein_expression_by_fluorescence_intensity"", ""antigen_bait_binding_by_fluorescence_intensity"", ""protein_expression_by_dna_barcode_count"" and ""antigen_bait_binding_by_dna_barcode_count"".
"
property	:ref:`Ontology <OntoVoc>`	required, nullable	"Name of the property observed, typically a gene or antibody identifier (and label) from a  canonical resource such as Ensembl (e.g. ENSG00000275747, IGHV3-79) or  Antibody Registry (ABREG:1236456, Purified anti-mouse/rat/human CD27 antibody).
"
value	number	required, nullable	Level at which the property was observed in the experiment (non-normalized).