May play an important role in honeybee nutrition. However, its role could not only be associated with larval development, because high level of mRNA is found in both forager and nurse honeybees (PubMed:12297291). No antimicrobial activity (tested on E.coli, B.subtilis or Paenibacillus l. larvae) has been observed (PubMed:12297291). Occurs as monomer and a variety of oligomers (PubMed:12297291). Interacts with apisimin to form the heterooligomer apisin (350 kDa) (PubMed:27721892). Royal jelly. High level of apisimin-mRNA is found in the heads of both nurse and forager honeybees. Is synthesized during the whole life span of honeybee.