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The apparent birefringence (Bapp) measured at maturity, middle and old age during stress relaxations at 6% strain. Bapp measured at the insertion was found to be significantly increased in WT tendons at middle age but not at maturity or in old age. This response was generally true at other strains evaluated (Fig. S3). Bars indicate significant differences (p<0.0167) and error bars indicate standard deviation.
