I have difficulty understanding why in this article approximately half of the quotes start with a letter in square brackets. What is the reason?
Some examples:
"[S]ame-sex segregation is a group phenomenon that arises from social processes that are related to gender identity and labeling common to all members of a sex, rather than to similarities in sex-typed activities."
"[t]he mental analog of sex: one's maleness, femaleness, etc., as seen from their own perspective"