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		Protocol References Ahrens et al. (1977). Stage-related capacity for limb chondrogenesis in cell culture. Dev. Biol. 60: 69-82. San Antonio et al (1992). Polyionic regulation of cartilage development: promotion of chondrogenesis in vitro by polylysine is associated with altered glycosaminoglycan biosynthesis and distribution.Dev. Biol. 152: 323-335. San Antonio and Tuan (1986). Chondrogenesis of limb bud mesenchyme in vitro: stimulation by cations. Dev. Biol. 115: 313-324. Tin-Xin Jiang, Jian-Ru Yi, Shao-Yao Ying, Cheng-Ming Chuong. (1993). Activin enhances chondrogenesis of limb bud cells: stimulation of precartiligenous mesenchymal condensations and expression of NCAM. Dev. Biol. 155: 545-557.