Hofert J F, Novak R A
Experientia. 1978 Jan 15;34(1):40-1. doi: 10.1007/BF01921888.
The addition of L-serine to short-term cultures of rat thymocytes stimulated the incorporation of 3H-deoxycytidine into DNA, but simultaneously depressed the incorporation of 3H-thymidine into DNA.