ACTB and infection: The HSP90 protein level in the fat body of G. mellonella subjected to abiotic (40 °C) or biotic stress (infections with M. luteus, E. coli, X. nematophila, and the nematode S. carpocapsae) was assessed by Western blot using anti-HSP90 antibodies (Figure 1, Figure 2, Figure 3 and Figure 4, Panels B); the obtained signal was normalized against the levels of the housekeeping protein β-actin (Figure 1, Figure 2, Figure 3 and Figure 4, Panels C).