Figure 2
From: Smoking induces increased apoptosis in osteoblasts: changes in bone matrix organic components

Percentage of Type I collagen in non-smokers, former smokers and smokers (n = 19, n = 22, n = 22 respectively). Significant differences were found in former smokers, and smokers compared with non-smokers (*p = < 0.001, Dunn's Test). Photomicrographs of Collagen Type I in bone tissue from femoral head-neck transition area. Values were expressed as mean ± SE (×400 magnification).