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Six-year-old transgender girl Coy Mathis, second from right, holds her mother Kathryn Mathis's hand as the family arrives for a news conference. The Colorado Civil Rights Division has ruled in favor of Coy Mathis, whose school had barred her from using the girls' bathroom at her elementary school because she is transgender. (AP Photo/Ed Andrieski) ( Transgender Complaint )

Six-year-old transgender girl Coy Mathis holds hands with her attorney Michael Silverman and her mother Kathryn Mathis at a news conference at the Capitol in Denver on Monday, June 24, 2013. The Colorado Civil Rights Division has ruled in favor of Coy Mathis, whose school had barred her from using the girls' bathroom at her elementary school because she is transgender. (AP Photo/Ed Andrieski) ( Transgender Complaint )

Kathryn Mathis, the mother of six-year-old transgender girl Coy Mathis, speaks at a news conference at the Capitol in Denver on Monday, June 24, 2013. The family attorney Michael Silverman listens at right. The Colorado Civil Rights Division has ruled in favor of six-year-old Coy Mathis, whose school had barred her from using the girls' bathroom at her elementary school because she is transgender. (AP Photo/Ed Andrieski) ( Transgender Complaint )

Family attorney Michael Silverman, right, holds hands with Coy Mathis as he speaks at a news conference at the Capitol in Denver on Monday, June 24, 2013. Standing next to Coy is her mother Kathryn Mathis. Her father Jeremy Mathis and other siblings are at left. The Colorado Civil Rights Division has ruled in favor of six-year-old Coy Mathis, whose school had barred her from using the girls bathroom at her elementary school because she is transgender. (AP Photo/Ed Andrieski) ( Transgender Complaint )

Six-year-old transgender girl Coy Mathis, left, her sister Auri and mother Kathryn Mathis walk to a news conference at the Capitol in Denver on Monday, June 24, 2013. The Colorado Civil Rights Division has ruled in favor of six-year-old Coy Mathis, whose school had barred her from using the girls' bathroom at her elementary school because she is transgender. (AP Photo/Ed Andrieski) ( Transgender Complaint )

Six-year-old Coy Mathis was front and center during a press conference on the steps of the Colorado State Capitol to announce that the Colorado Civil Rights Division has ruled in favor of Coy Mathis, whose school had barred her from using the girls’ bathroom at her elementary school because she is transgender, June 24, 2013. Coy was labeled male at birth, but has always known that she is a girl, which she has expressed since she was 18 months old.(Photo By RJ Sangosti/The Denver Post) ( MATHIS_RJ16114 )

Six-year-old Coy Mathis, along side her mother, was front and center during a press conference on the steps of the Colorado State Capitol to announce that the Colorado Civil Rights Division has ruled in favor of Coy Mathis, whose school had barred her from using the girls’ bathroom at her elementary school because she is transgender, June 24, 2013. Coy was labeled male at birth, but has always known that she is a girl, which she has expressed since she was 18 months old.(Photo By RJ Sangosti/The Denver Post) ( MATHIS_RJ29084 )