Identification of two genes from Streptomyces argillaceus encoding two glycosyltransferases involved in the transfer of a disaccharide during the biosynthesis of the antitumor drug mithramycin - Fernández, E; Weibbach, U; Sánchez Reillo, C; Braña, A F; Méndez, C; Rohr, J; Salas, J A (J Bacteriol, 1998)