This family includes scorpion potassium channel toxins [1-2].

1: Expression, purification and functional characterization of a recombinant scorpion venom peptide BmTXKbeta. Cao Z, Xiao F, Peng F, Jiang D, Mao X, Liu H, Li W, Hu D, Wang T; Peptides. 2003;24:187-192. PMID:12668201

2: Tityustoxin K alpha blocks voltage-gated noninactivating K+ channels and unblocks inactivating K+ channels blocked by alpha-dendrotoxin in synaptosomes. Rogowski RS, Krueger BK, Collins JH, Blaustein MP; Proc Natl Acad Sci U S A. 1994;91:1475-1479. PMID:7509073