Single chain Fragment variable (scFv)
Representation of a scFv with the IMGT Labels for the two V-DOMAIN.
The relative position 5' and 3' of the two V-DOMAIN in the scFv, in this figure, is arbitrary. At least 23 and 19 labels are necessary to describe a V-D-J-REGION and a V-J-REGION, respectively in IMGT/V-QUEST. The conserved 1st-CYS 23, CONSERVED-TRP 41, 2nd-CYS 104 and J-TRP or J-PHE 118 based on the IMGT unique numbering are shown in both V-DOMAIN [1-4].