Qualifier prod_ft
Definition a protein feature (product feature)
Value Format "structured text =(pos:location,key,"description")"
Example /prod_ft=(pos:384..746,chain,"E2 protein")
Comment The /prod_ft qualifier are used to store annotation on protein sequence.
They follow the FT line definition of UniProt database.
Currently defined keys are:

Prod_ft Keys Definition
chain Extent of a polypeptide chain in the mature protein.
domain Extent of a domain of interest in the sequence.
init_met Initiator methionine.
model3d Calculated 3d model. (link on 3d viewer - Jmol)
site Any other interesting site on the sequence.
transmem Extent of a transmembrane region.