References:
McDaniel, Robert; Ebert-Khosla, Susanne; Hopwood, David A.; Khosla, Chaitan (1993), “Engineered Biosynthesis of Novel Polyketides”, Science 262 (5139): 1546-1550.
McDaniel, Robert; Thamchaipenet, Arinthip; Gustafsson, Claes; Fu, Hong; Betlach, Melanie; Betlach, Mary; Ashley, Gary (1999), “Multiple genetic modifications of the erythromycin polyketide synthase to produce a library of novel “unnatural” natural products”, Proceedings of the National Academy of Sciences of the United States of America 96 (10): 1846-1851.