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activity adrenalin Amphibia animals Anura apocodeine appear atropine autacoid Axolotls black pigment bodily colour brown cell body cell processes Chameleon characteristic chromato chromatophores co-ordinating mechanism colour change colour response contracted phase Crustacea dark dermal direct display effect epidermal evidence evoked experimental experiments factor Frisch Hippolyte histological hypophysectomised frog individuals induce darkening injected innervation intensity of illumination investigation larvae Laurens light lumbosacral plexus Macromysis melano melanophore contraction melanophore expansion melanophore stimulant melanophores of Fishes microscopic Molluscs nature nerve supply nervous control normal observations oxytocic pale frogs pallor pars intermedia partial expansion phores physiology physiology of colour pigment pigment cells pigment granules pigmentary changes pigmentary effector organs pigmentary effector system pigmentary response pilocarpine pituitary extract pituitary gland pituitary secretion plain muscle posterior lobe pressor produced promote melanophore receptor Redfield regulation of colour remained pale Reptiles response in Fishes Reticulate skin Spaeth Stellate temperature tion tissue Urodeles Vertebrata Vertebrates yellow pigment