Fig. 7. Regional variation in elastic modulus at a stress of 2.0 MPa. Elastic moduli increased posteriorly at a similar rate at both stress levels. A distinct increase exists between the moduli of anterior regions (a–e) and posterior regions (f–i) at both stresses, indicating a sharp increase in skin stiffness. Symbols represent means ± S.E.M. (a, c, e, i, N=10; b, N=9; d, f–h, N=11). Results of a Tukey multiple comparison test identify homogeneous regions.