A cDNA phage library was constructed from venom glands of a single adult specimen of crotamine-plus Crotalus durissus terri®cus (South American rattlesnake) captured in a known region. Fifteen crotamine positive clones were isolated using a PCR-based screening protocol and sequenced. These complete cDNAs clones were grouped for maximal alignment into six distinct nucleotide sequences. The crotamine cDNAs, with ...