This family contains several uncharacterised staphylococcal proteins. These proteins have been called conserved staphylococcal antigens (Csa) [1].

1: Mining the bacterial unknown proteome: identification and characterization of a novel family of highly conserved protective antigens in Staphylococcus aureus. Schluepen C, Malito E, Marongiu A, Schirle M, McWhinnie E, Lo Surdo P, Biancucci M, Falugi F, Nardi-Dei V, Marchi S, Fontana MR, Lombardi B, De Falco MG, Rinaudo CD, Spraggon G, Nissum M, Bagnoli F, Grandi G, Bottomley MJ, Liberatori S; Biochem J. 2013;455:273-284. PMID:23895222