Robert Stoller "introduced the term 'gender identity' to the International Psychoanalytic Congress at Stockholm in 1963. He formulated the concept of gender identity within the framework of the biology/culture distinction, such that sex was related to biology (hormones, genes, nervous system, morphology) and gender was related to culture (psychology, sociology)"
Mol here is quoting Donna Haraway's "Gender for a Marxist Dictionary: The Sexual Politics of a Word" (1991)
this "made it possible to talk about a person's 'gender' irrespective of the biological 'sex' of her/his body" (Mol, 20)
Note that Haraway warns "that feminists who fight biological determinism in a dichotomizing way, one that puts the body's 'sex' in a safe domain before starting to discuss a person's 'gender,' leave biology unanalyzed" (Mol's summation, 22)