
1) Ion channel toxin 
Found on 
https://www.crosswordclues.com/clue/apamin

 Apamin is an 18 amino acid peptide neurotoxin found in apitoxin (bee venom). Dry bee venom consists for 2-3% of apamin. Apamin selectively blocks SK channels, a type of Ca2+-activated K+ channel expressed in the central nervous system. Toxicity is caused by only a few amino acids, these are cysteine1, lysine4, arginine13, arginine14 and histidine1...
Found on 
http://en.wikipedia.org/wiki/Apamin

<protein> A small (2027 D) basic peptide present in the venom of the honey bee (Apis mellifera). Blocks calcium activated potassium channels and has an inhibitory action in the central nervous sytem. ... (18 Nov 1997) ... 
Found on 
http://www.encyclo.co.uk/local/20973

A small (2027 D) basic peptide present in the venom of the honey bee ( Apis mellifera ). Blocks calcium-activated potassium channels and has an inhibitory action in the central nervous sytem.
Found on 
http://www.encyclo.co.uk/visitor-contributions.php
  No exact match found.