BGLAP and osteoporosis: However, biochemical markers of bone formation and resorption including osteocalcin (OC), procollagen type 1 amino-terminal propeptide (PINP), C-terminal telopeptide of type I collagen (CTX), N-terminal telopeptide of type I collagen (NTX), deoxypyridinoline, tend to be lower in diabetes patients (2), which is quite similar to what is observed in glucocorticoid-induced osteoporosis.