Fig. 5

Principle component analysis (PCA) of biomineralization-related gene expression profiles at different phases of pearl grafting. The X- and Y- axes represent PC1 and PC2 respectively. Different colors of data points indicate different time points (cell, before, 0 h, 24 h, 48 h, 1 w, 2 w, 1 m and 3 m). All the samples were clustered in two separate groups as indicated by two different shapes: triangle for cell, before and 0 h to 48 h; round for 1 w to 3 m