Reduced expression of major royal jelly protein 1 gene in the mushroom bodies of worker honeybees with reduced learning abilityMasaru Hojo, Takahiro Kagami, Tetsuhiko Sasaki, Jun Nakamura and Masami SasakiApidologie, 41 2 (2010) 194-202DOI: https://doi.org/10.1051/apido/2009075