RPS18 and bacterial infectious disease: rps18 is among the most stable genes during the development of Tribolium castaneum (Coleoptera)45, Leptinotarsa decemlineata (Coleoptera)46 and Lipaphis erysimi (Hemiptera)47, and in nurses and foragers of A. mellifera19–24, and also after bacterial infection in A. mellifera20 and fungal infection in T. castaneum48.