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Description
Both endogenously produced and dietary melatonin are rapidly metabolised, primarily in the liver, and are excreted in urine as 6-sulfatoxymelatonin

These melanocytes produce melanin, a black/brown or in some cases red/blonde pigment

Dityrosine, a fluorescent molecule, is known to emit between 400 and 430 nm 29
For example, one study suggested that caveolin-mediated LRP6 endocytosis promotes Axin recruitment and is required for Wnt stabilization of -catenin (Yamamoto et al., 2006), while another study using caveolin / mutant mice reached the apparently opposite conclusion (Sotgia et al., 2005)

Obayashi et al
