Donahue, S. W. et al. (2003) Serum markers of bone…, Clinical Orthopaedics and Related Research, 406. Copyright © Dr S. W. Donahue
Figure 14 The bone formation marker (PICP) in the blood of female black bears. Bears entered dens in December and left in mid-April. Each point represents measurements from a blood sample taken from an individual bear. Each of nine bears was sampled once while in the den and once while active, but the exact day was determined by when they could be found and conveniently tranquilized