328notes317[1] - zol 328 notes 3/17 INTEGUMENT melanin (2...

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zol 328 notes 3/17 INTEGUMENT melanin (2 types) eumelanin —black pigment --blond, brown, black hair --skin pigment phaeomelanin —reddish --red hair synthesized from phenylalanine phenylalanine-->tyrosine-->DOPA-->melanin if phenylalanine-//->tyr, then PKU occurs (in infants) mental retardation controlled by diet low in phenylalanine if DOPA-//->melanin, then albinism occurs --siamese cats and himalayan rabbits have a mutation in tyrosinase gene only folds properly at low temperatures (inactive at warm temps) only produce melanin at extremities, because the body core is too warm glands many lie in the dermis but originate in the epidermis (epidermal glands) grow downwards sweat glands sebaceous glands—oily and waxy material often open onto hair follicles mammary glands—derived from either sweat or sebaceous glands mammalian synapomorphy during development, form "milk line" usu. on ventral side; varying numbers (figure 6.10 in book has lots of types of glands) dermis connective tissue can produce bone (dermal) blood vessels plentiful blood can be shunted to or from dermis to control body temp nerves plentiful multicellular glands, bases of hair and feathers lie in dermis, despite epidermal origin
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This note was uploaded on 03/27/2010 for the course ZOL 328 taught by Professor Hill during the Spring '08 term at Michigan State University.

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328notes317[1] - zol 328 notes 3/17 INTEGUMENT melanin (2...

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