RE: but I kept on reading and now I don’t have an image in my head of mice with female boobs in a lab somewhere.
It says in the article:
mice with human breast, ovary, colon, bladder, brain, liver and prostate TUMORS (my emphasis) transplanted into them.
They did not give the mice human breasts, they gave them HUMAN BREAST TUMORS.
Don’t have a sense of humor do you.