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Comment :

Type  MGI:General Description  despite increased calcium serum levels, heterozygotes show a significant increase in serum parathyroid hormone (PTH) levels when fed with Ca2+ contents of 2.5%, 0.6% or 0.02% for 3 weeks, heterozygotes do alter PTH release on response to increases in dietary Ca2+, although the serum calcium concentration associated with a given level of PTH is higher in heterozygotes relative to wild-type