Influence of feeding and UVB exposition on the absorption mechanisms of calcium in the gastrointestinal tract of veiled chameleons...

kinyonga

Chameleon Queen
Calbindin (CB-D28k) is a vitamin D–responsive gene that mediates calcium absorption.

"The two groups treated with all dietary supplements (CaADUV, CaAD) exhibited a higher Cb‐D28k immunoreaction as those with no supplements and UVB exposure only"...

"Expression of Cb‐D28k, in particular, appears to be regulated by dietary supplementation of vitamin D and vitamin A. VDRs, however, tended to be upregulated when animals were not supplemented with Ca, vitamin D and vitamin A. This may be due to the decreased Ca concentrations which caused vitamin D activation in the skin without any supplementation, but UVB exposure."...

https://onlinelibrary.wiley.com/doi/10.1111/jpn.12206
 
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