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. 2020 Sep 4;6(36):eabc1968. doi: 10.1126/sciadv.abc1968

Fig. 2. Proportion of bone collagen formed in preceding gestational weeks at given ages.

Fig. 2

For a prenate at age 33 gestational weeks (GW), 64% of existing collagen was formed in the previous 4 weeks (30th to 33rd week), while for a newborn (40 GW), 55% of bone collagen was formed in the previous 4 weeks. For a neonate at 3 postnatal weeks (PW), 26% of bone collagen was formed in the previous 4 weeks, and 68% was formed in the previous 8 weeks. Estimates are based on a new model of fetal bone collagen turnover (tables S6 and S7); postnatal estimates are based on a previously published model (15).