> They could equally well be attached to sperm just before sexual intercourse. Ms Chan therefore concentrated her attentions on part of the male genital tract

> They could equally well be attached to sperm just before sexual intercourse. Ms Chan therefore concentrated her attentions on part of the male genital tract called the epididymis. This is where sperm mature. Cells lining the epididymis constantly discharge small, fluid-filled, membrane-bound bubbles called vesicles. When Ms Chan, working with mice, looked in detail at these vesicles, she found that they contained lots of micro-RNAs. So, if you have unprotected sex with a women who recently was or will be impregnated by another man, you can still pass your microRNA and affect the child?