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Figure 4 | BMC Evolutionary Biology

Figure 4

From: Development of the ultrastructure of sonic muscles: a kind of neoteny?

Figure 4

Fiber diameter (Mean ± SD) of sonic and epaxial muscles in Pygocentrus nattereri of different standard length. The black line represents the linear regression for sonic muscle and the dotted line represents the linear regression for the epaxial muscle. Note that epaxial muscle diameter of younger fish (3 and 25 mm) are on the same slope as sonic muscles.

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