Cloning and screening with nanogram amounts of immunopurified mRNAs: cDNA cloning and chromosomal mapping of cystathionine beta-synthase and the beta subunit of propionyl-CoA carboxylase - Kraus,J.P.; Williamson,C.L.; Firgaira,F.A. (Proc Natl Acad Sci USA, 1986)