Phospholipase A2, an enzyme in bee<unk> , releases fatty acids, affecting calcium signalling.<unk> s cause their biological effects via the many toxins that they contain; some<unk> s are complex mixtures of toxins of differing types. Major classes of toxin in<unk> s include: * Necrotoxins, which cause necrosis (i.e., death) in the cells they encounter. The<unk> s of vipers and bees contain phospholipases; viper<unk> s often also contain trypsin-like serine proteases. * Neurotoxins, which primarily affect the nervous systems of animals, such as ion channel toxins. These are found in many<unk> ous taxa, including black widow spiders, scorpions, box jellyfish, cone snails, centipedes and blue-ringed octopuses. * Myotoxins, which damage muscles by binding to a receptor. These small, basic peptides are found in snake (such as rattlesnake) and lizard<unk> s. * Cytotoxins, which kill individual cells and are found in the apitoxin of honey bees and the<unk>  of black widow spiders.
Venom
Body fluid
Blood
Bleb 
Clinic
Heart
Serum 
Port 