POLYMORPHISM STUDY OF BONE METABOLISM GENES (COLLAGEN TYPE 1 (COL1A1-SP1), CALCITONIN RECEPTOR (CTR-ALUI), VITAMIN D RECEPTOR (VDR-FOKI, VDR-BSMI) AND ESTROGEN RECEPTOR (ESRALFA-XBAI, ESRALFA -PVUII) IN THE DIAGNOSIS AND PREVENTION OF BONE DISEASE IN RENAL TRANSPLANT PATIENTS.: 2264