Intersex people are individuals born with any of several variations in sex characteristics including chromosomes, gonads, sex hormones or genitals that, according to the Office of the United Nations High Commissioner for Human Rights, "do not fit the typical definitions for male or female bodies". Though the range of atypical sex characteristics may be obvious from birth through the presence of physically ambiguous genitalia, in other instances, atypical characteristics may go unnoticed, presenting as ambiguous internal reproductive organs or atypical chromosomes that may remain unknown to an individual all of their life.