Joint Contractures, Osteochondromas, and B-Cell Lymphoma, also known as jcosl, is related to adult syndrome and exostosis. An important gene associated with Joint Contractures, Osteochondromas, and B-Cell Lymphoma is NFATC2 (Nuclear Factor Of Activated T Cells 2). Affiliated tissues include b cells and t cells, and related phenotypes are reduced bone mineral density and hip contracture