text_1: S-nitrosylated GAPDH physiologically transnitrosylates histone deacetylases.
text_2: As the three principal isoforms of NOS--neuronal NOS (nNOS), endothelial NOS (eNOS) and inducible NOS (iNOS)--are primarily non-nuclear, the mechanisms by which nuclear proteins are selectively nitrosylated have been elusive.