MeSH note : an inhibitor of the Kv2.1 potassium channel; from the venom of the Chilean tarantula,
G. spatulata; HaTx1 differs from HaTx2 only at residue 13 where HaTx1 has Ser and
HaTx2 has Ala; amino acid sequences of HaTx1 and HaTx2 given in first source;