CYP24A1 and hypercalcemia, infantile, 2: Since mutations in the SLC34A1 (solute carrier family 34 member 1, a type II sodium-phosphate cotransporter) gene cause a similar clinical presentation [7], the nomenclature has been changed to infantile hypercalcemia type 1 for CYP24A1 mutations (HCINF1, OMIM 143880) and infantile hypercalcemia type 2 for SLC34A1 affected patients (HCINF2, OMIM 616963).