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Talmadge K, et al. Only three of the seven human chorionic gonadotropin beta subunit genes can be expressed in the placenta. Nucleic Acids Res. 12: 8415-8436, 1984. PubMed: 6209613

Talmadge K, et al. The human genome contains seven genes for the beta-subunit of chorionic gonadotropin but only one gene for the beta-subunit of luteinizing hormone. DNA 2: 281-289, 1983. PubMed: 6319099

Talmadge K, et al. Evolution of the genes for the beta subunits of human chorionic gonadotropin and luteinizing hormone. Nature 307: 37-40, 1984. PubMed: 6690982

Barbara Weiffenbach, personal communication