>4kv5_E mol:protein length:252 Single-chain variable fragment GC1009 QVQLVQSGAEVKKPGSSVKVSCKASGYTFSSNVISWVRQAPGQGLEWMGGVIPIVDIAN YAQRFKGRVTITADESTSTTYMELSSLRSEDTAVYYCASTLGLVLDAMDYWGQGTLVTV SSGGGGSGGGGSGGGGSALETVLTQSPGTLSLSPGERATLSCRASQSLGSSYLAWYQQK PGQAPRLLIYGASSRAPGIPDRFSGSGSGTDFTLTISRLEPEDFAVYYCQQYADSPITF GQGTRLEIKRHHHHHH