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Fig. 2. Cross-section of the dorsal epaxial musculature at the level of the
posterior gut from a 21 d.p.h. larval haddock incubated at 6°C, stained
with Paragon, indicating distinctive cellular features. Bar, 30 µm. spF,
superficial myofibres; dF, deep myofibres; sF, small myofibres; mt,
mitochondria; ssPZ, superficial-deep septum proliferation zone; daPZ, dorsal
apical proliferation zone; nt, neural tube.