Phylogenetic Tree

Melittin

Melittin is the main component (40–60% of the dry weight) and the major pain producing substance of honeybee (Apis mellifera) venom. The principal function of melittin as a component of bee venom is to cause pain and destruction of tissue of intruders that threaten a beehive. The two venom molecules, melittin and secapin, that are over-expressed in honey bees infected with various pathogens, possibly indicate a role for melittin in the immune response of bees to infectious diseases.

--From Wikipedia