Fig. 1From: Estrogen-related receptors: novel potential regulators of osteoarthritis pathogenesisStructure of estrogen receptor α and the three estrogen-related receptors. ERRs are composed of six conserved regions (A/B, C, D, and E/F domains), and the colors symbolize the diverse functions of these domains. The number between the two receptors represents the sequence identity of the same domain in the different receptorsBack to article page