Macrophotograph of the scales on a Krishna peacock (Papilio krishna) butterfly wing. The colour of a butterfly's wing can arise either from a pigment contained in the scales or from the actual structure of the scales themselves.

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Photo credit: © FRANK FOX/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -lymphocyte, activated, anatomy, blood, body, cell, cell-mediated, cells, cytotoxic, destruction, false-coloured, human, immune, killer, response, white