The method by which the sample for the entity was produced.
Entities isolated directly from natural sources (tissues, soil
samples etc.) are expected to have further information in the
ENTITY_SRC_NAT category. Entities isolated from genetically
manipulated sources are expected to have further information in
the ENTITY_SRC_GEN category.
Additional Descriptive Information for Depositors
The method by which the sample for the entity was produced
Data Type
Data type code
ucode
Data type detail
code item types/single words (case insensitive) ...