Sang Kil Lee, Devi Bahadur Basnet, Cha Yong Choi, Jae Kyung Sohng, Jong Seog Ahn and Yeo Joon Yoon "The Role of Erythromycin C-12 Hydroxylase, EryK, as a Substitute for PikC Hydroxylase in Pikromycin Biosynthesis" Bioorganic Chemistry, 2004 Nov, 32(6), 549-559.