Fig. 6. Transmission electron micrographs of structurally coloured and carotenoid pigmented bird skin. Collagen macrofibrils of (A,B) Tragopan satyra and (C) Tragopan caboti. Lipid-filled pigment cells immediately under the epidermis in (D) Dyaphorophyia concreta yellowish green, (E) Tragopan caboti orange and (F) Ramphastos toco yellow. Scale bars represent 5 µm (A,D–F) or 2 µm (B,C). Abbreviations: c, collagen macrofibrils; e, epidermis; l, lipid vacuoles; m, melanosomes.