Compressive modulus of cell-free and cell-laden gels throughout <i>in-vitro</i> culture.

<p>(<b>A</b>) The compressive modulus of cell-free gels on days 1 and 28; (B) compressive modulus of cell-laden gels on days 1, 28 and 56; and (C) change in modulus between day 1 and day 28 and day 1 and day 56. The compressive modulus increased in all gels with culture time, and HA-MA had a significant impact on the rate of increase. * indicates a difference between days 1 and 28, and † indicates a difference between days 28 and 56. In each panel, groups without a like Roman numeral are significantly different, and upper and lower cases should be considered separately.