<prompt> All of the following play a significant role in bone resorption except:Parathyroid hormone.Interleukin1.Interleukin6.Interferon-gamma.  <response>: Pro-resorptive factors are hormones and cytokines are:-PTH Parathyroid hormone1,25dihydroxyvitamin D3,IL-1IL-6TNF Tumour necrosis factorLIF Leukaemia inhibitory factorCorticosteroids, which activate osteoblasts and stroma cells to produce RANKL and depress OPG. 