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Julie Johnson of Utah says she explored the possibility of becoming an egg donor but ultimately changed her mind. Then the clinic turned on her. (James Roh for Undark)

For a change of heart, would-be egg donors face threats and bills

Alison Motluk

“Of Moths and Men” by Judith Hooper

Alison Motluk

“Genes, Girls and Gamow” by James D. Watson

Alison Motluk

“Future Evolution” by Peter Ward

Alison Motluk

“Blue Cats and Chartreuse Kittens” by Patricia Lynne Duffy

Alison Motluk