Sealy-Lewis H M, Lycan D, Scazzocchio C
Mol Gen Genet. 1979 Jul 2;174(1):105-6. doi: 10.1007/BF00433311.
By the use of a mutation, hxB-20, that eliminates purine hydroxylase II activity but retains cross-reacting material and an ancillary NADH dehydrogenase activity, it has been established that 6-hydroxynicotinic acid rather than nicotinic acid, is the true inducer of purine hydroxylase II.