Zona thinning: 'laying it on thick'.
Cohen
Jacques
J
D002138:Calibration; D005260:Female; D005307:Fertilization in Vitro / Q000009:adverse effects / Q000379:methods*; D006801:Humans; D008297:Male; D015044:Zona Pellucida / Q000502:physiology* / Q000648:ultrastructure