“From the results of this study, it is concluded that the duodenum plays the most important role in the active transcellular absorption of calcium in veiled chameleons, which is in accordance with many mammals. Furthermore, different feeding and light regimes strongly influence the Cb-D28k expression, but not the VDR expression in the DD.”…
https://pmc.ncbi.nlm.nih.gov/articles/PMC4280901/
https://pmc.ncbi.nlm.nih.gov/articles/PMC4280901/