McGing P G, Scott J M
Br J Nutr. 1980 Jan;43(1):235-7. doi: 10.1079/bjn19800082.
The decreased folate uptake induced by exposure of rats to nitrous oxide can be partly reversed by methionine supplementation. This is consistent with the theory that N2O inhibits methylcobalamin-dependent methionine synthetase (EC 2.1.1.13) in rat liver and previous observations showing decreased folate incorporation in rats made nutritionally vitamin B12 deficient.