Figure 4 raw data: Effect of continuous exposure to PTHrP (1-36) on bone nodules and ap-positive osteogenic cell colonies in low plating density cultures. KamelSuzan YeeJohn 2013 <p>The number of bone nodules (A) and AP positive colonies (B) in RC cells plated in low density and continuously exposed to 0 to 100 nM PTHrP (1-36) for 18 days.</p>