Fig. 2.

Modulation of odor-based preference of females for a potential mate through four different stickleback 9-mer peptides. (A) In a two-choice flow channel, single gravid females chose between the water from the tank of a single male supplemented with either solvent only or four stickleback peptides in solvent. The time females spent in the side of the flow channel to which water from the tank of a single male plus peptides in solvent was added (of a total of 600 s) is shown as a function of the combined number of different MHC class IIB alleles of male and female. (B) Reversal of female response to added peptides on the day after spawning; results are shown otherwise as in A.