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Principal Components Analysis of form and shape at E17.5. A) Placement of all E17.5 mouse crania on PC1 and PC2 in the skull form space (as estimated by principal component analysis of all possible linear distances among cranial 33 landmarks on all E17.5 mice). B) Placement of all E17.5 mouse crania on PC1 and PC2 in the skull shape space (as estimated by principal component analysis of all possible linear distances of each observation, scaled by the observation’s geometric mean).
