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Fig. 10. Transmission electron micrographs of the iridophores in the arm stripes of
the squid (L. pealeii) (A) and the cuttlefish (S.
officinalis) (B). Sections were cut perpendicular to the longitudinal
axis of the arm. The arrow in each graph indicates the direction toward the
nearest skin surface. C, pigment granules of a chromatophore. Scale bars, 7.5
µm.