Has potent hemolytic activity (PubMed:10964708). Is lethal to crayfish (PubMed:10964708). Causes cutaneous inflammation in humans (Probable). May act as a pore-forming toxin, disrupting normal transmembrane ion concentration gradients in susceptible cells (Probable). Oligomer. Forms a membrane channel in the prey. It is suggested that CaTX-B is synthesized in the tentacle, is modified (become CaTX-A) and then migrates to the nematocyst. Contains disulfide bonds. LD(50) is 5-25 ug/kg by intraperitoneal injection into crayfish. CaTX-A and CaTX-B are probably encoded by the same gene (Probable). They differ by their molecular masses (43 and 45 kDa, respectively) (PubMed:10964708). In addition, CaTX-A is primarily localized in nematocysts, whereas CaTX-B is only detected in the tentacles without nematocyst (PubMed:10964708). Belongs to the jellyfish toxin family. Type II subfamily.