http://weeksmd.com/2009/11/vitamin-abeta-carotene-a-ok-by-me-a-review/
"Of primary importance, on the other hand, to the old world chameleon, are the other 400-odd carotenoids which it ingests by feasting on exotic bugs which themselves have eaten myriad plant isoprenoid pigments. Once within the chameleon, not only do these carotenoids sequester themselves within reptilian dermal cells (prismatically formed to magnify the color changing effect) but they directly support osteoblastic activity." ...
"Of primary importance, on the other hand, to the old world chameleon, are the other 400-odd carotenoids which it ingests by feasting on exotic bugs which themselves have eaten myriad plant isoprenoid pigments. Once within the chameleon, not only do these carotenoids sequester themselves within reptilian dermal cells (prismatically formed to magnify the color changing effect) but they directly support osteoblastic activity." ...