Letter: Letters : Pee is for steroid

Published 21 February 1998

From Grzegorz Nalepa

Gliwice, Poland

Purifying human proteins from transgenic animals’
urine is an intriguing development
(This Week, 10 January, p 7).
But oestrogen is not a protein, as stated, but a steroid.

Issue no. 2122 published 21 February 1998

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