Summary of samples used in this study and cell expressing various genes in female-male and left-right embryonic gonads.

F: Female; M: Male (** p-value p-value t-test).a1: a comparison between female left and right gonad sections; b1: a comparison between female left and right cortices; c1: a comparison between female left and right medullae; a2: a comparison between male left and right gonad sections; b2: a comparison between male left and right cortices; c2: a comparison between male left and right medullae.