Osteoclasts in Bone with TTP/Without TTP (IMAGE) University at Buffalo Caption The removal of the gene that produces TTP progressively increases the presence of osteoclasts (red) -- cells that break down and absorb bone -- causing rapid bone loss in mice (middle) compared with healthy mice (left). Credit Photo: Keith Kirkwood Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.