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Figure 2. Example of an area showing the antero-deep portion of the masseter incubated with antibodies against MyHC-I (A), MyHC-cardiac {alpha} (B), MyHC-IIA (C), MyHC-fetal (E), and MyHC-IIA and -IIX isoforms (F). Lower magnification of cross-sections in (A-F) is shown in (D). Drawing (G) shows some of the fiber types: (1) MyHC type I, (2) MyHC type IIX, (5) MyHC type IIA, (6) MyHC type I+IIA, (7) MyHC type fetal+I, and (8) MyHC type fetal+cardiac {alpha}+I.