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womb

puberty

sperm

Pembrey

Hand-drawn

Olov

er

They discovered that when a famine was able to trigger an effect was different for the grandmother than the grandfather. The grandmother appeared susceptible while she herself was still in the womb, while the grandfather was affected just before puberty.
And the timing of this sensitive period was telling us that it was tied in with the formation of the eggs and the sperm.
This was critical, because now they knew how it was happening. Environmental information was being imprinted on the egg and sperm at the time of their formation. At last, a clear picture of an inherited environmental effect was beginning to emerge. All they needed to do now was to compile their findings. Bygren drew up a rough diagram, and sent it to Pembrey.
Hand-drawn, this is what Olov sent me. You know, he was too excited to wait for the thing to be drawn up properly. You know, he sent me the data. Er, in fact I was recovering, er, from having something down to my heart. So he sent it saying, er, I hope this, helps you get better quickly, because it was so exciting.

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