“…carinii organisms express a surface antigen known as the major surface glycoprotein (MSG) (Walzer & Linke, 1987;Kovacs et al, 1988;Tanabe et al, 1989;Nakamura, 1998;. Multiple forms of MSG are encoded by a family of approximately 100 genes, members of which are located at 34 telomeric sites (Stringer et al, 1991;Kovacs et al, 1993;Sunkin et al, 1994;Sunkin & Stringer, 1996, 1997Cornillot et al, 2002;Keely et al, 2003). Other species of Pneumocystis, including the species that infects humans, also have families of MSG genes (Haidaris et al, 1991;Stringer et al, 1993;Garbe & Stringer, 1994;Wright et al, 1995;Mei et al, 1998;Haidaris et al, 1998;Schaffzin et al, 1999;Kutty et al, 2001).…”