Figure 1
From: Morphological and acrosomal changes of canine spermatozoa during epididymal transit
Principal component biplot of variables in the space of the first two principal components (PC). The length of each vector represents the weight of the variable in the plane, and the angle between variables quantifies the correlations among the variables. The objects (i.e. the samples) dispose themselves in the space of the PC relating to the variables: an object close to the end of a vector is highly correlated to the variable. Convex hulls include the spermatozoa samples from caput (cross), corpus (hollow square), and cauda (full square).