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Tissue composition
• How accurate are published ‘reference’ tissues?
• Variability over population?
• Variability with age (breast)
• The myth of the 50-50 breast (Yaffe et at MP 2009)
Breast was long assumed: 50% adipose, 50% gland (brighter above)
Reality: mean composition is much closer to 80% A / 20% G
Afsharpour et al PMB 2011