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Fig. 1. Red-phase and green-phase male Carcinus maenas differ in the
occurrence of methyl farnesoate (MF) in their hemolymph and in their
testicular development. (A) Red-phase males (N=37) are more likely to
have detectable MF (>2 ng ml–1) in their hemolymph than
green-phase animals (N=24; **P<0.01; Fisher's
exact test). (B) The testicular index (TI) was 79% greater in red-phase than
in green-phase crabs (values ± s.e.m.; N=12 for each group;
***P<0.001; Student's t-test).