The identification of a putative apical Ca++ channel in 1,25dihydroxyvitamin D3 responsive epithelia (proximal intestine and the distal nephron) as well as recent studies using calbindin-D28k knock-out mice indicating the first direct in-vivo evidence for a role for this calcium-binding protein in renal calcium absorption suggest mechanisms, which had remained incomplete, related to the control of renal calcium absorption.
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Sooy et al. (2000) studied this question.
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