Figure 1.

Bone composition. Ternary diagram illustrating the composition of mature bones in different species (adapted from Currey J.D. ‘Bones'. Princeton University Press: Princeton, NJ, 2002, p 436.) and reproduced with permission from Journal of Experimental Biologists, Figure 7B in ‘Comparison of structural, architectural and mechanical aspects of cellular and acellular bone in two teleost fish'.14 The speckled circle is the average of data from five iliac crest biopsies of females aged 69–75 years.