Table 2.

Summary of Pax3, Pax7, Myf5, MyoD, Myogenin, and Mrf4 expression in embryonic, fetal/neonatal, and adult progenitors, myoblasts, and myofibers.

	Pax3	Pax7	Myf5	MyoD	Mrf4	Myogenin
Embryonic Progenitors	+ (reviewed in Buckingham, 2007; Relaix et al., 2004)	+ (reviewed in Buckingham, 2007; Relaix et al., 2004)	−	−	−	−
Embryonic Myoblasts/Myocytes	−	−	+ (myoblasts) (Biressi et al., 2007; Kassar-Duchossoy et al., 2005; Ott et al., 1991)	+ (myoblasts) (Ontell et al., 1993a; Sassoon et al., 1989)	−/?	+ (myocytes) (Ontell et al., 1993a; Sassoon et al., 1989)
Embryonic Myofibers	−	−	−	+ (Ontell et al., 1993a; Sassoon et al., 1989)	− (Bober et al., 1991)	+ (Ontell et al., 1993a; Sassoon et al., 1989)
Fetal Progenitors	−	+ (reviewed in Buckingham, 2007; Relaix et al., 2004)	−	−	−	−
Fetal Myoblasts/Myocytes	−	−	+ (myoblasts) (Biressi et al., 2007; Kassar-Duchossoy et al., 2005)	+ (myoblasts) (Ontell et al., 1993b)	−	+ (myocytes) (Ontell et al., 1993b)
Fetal Myofibers	−	−	−	+ (Ontell et al., 1993b)	+ (Bober et al., 1991)	+ (Ontell et al., 1993b)
Adult Progenitors	+/− (Conboy and Rando, 2002; Relaix et al., 2006)	+ (Seale et al., 2000)	+/− (Beauchamp et al., 2000; Cornelison and Wold, 1997; Kuang et al., 2007)	− (Cornelison and Wold, 1997; Kanisicak et al., 2009; Yablonka-Reuveni et al., 1999)	− (Cornelison and Wold, 1997; Gayraud-Morel et al., 2007)	− (Cornelison and Wold, 1997)
Adult Myoblasts/Myocytes	−	−	+ (myoblasts) (Cornelison and Wold, 1997; Kuang et al., 2007)	+ (myoblasts) (Cornelison and Wold, 1997; Kanisicak et al., 2009; Yablonka-Reuveni and Rivera, 1994)	+/− (Cornelison, 2008; Gayraud-Morel et al., 2007)	+ (myocytes) (Cornelison and Wold, 1997; Yablonka-Reuveni and Rivera, 1994)
Adult Myofibers	−	−	− (Hinterberger et al., 1991; Voytik et al., 1993)	+ (Hinterberger et al., 1991; Kanisicak et al., 2009; Voytik et al., 1993)	++ (Gayraud-Morel et al., 2007; Haldar et al., 2008; Hinterberger et al., 1991; Voytik et al., 1993)	+ (Hinterberger et al., 1991; Voytik et al., 1993)