PCA of PEL. PCA shows the presence of 2 distinct clusters formed by endothelial cells in green and all the 17 (excluding JSC1) PEL cells in blue, irrespective of whether they were from culture or xenograft. The x-, y-, and z-axes represent PC1, PC2, and PC3, respectively, accounting for 14.9%, 12.2%, and 11.7% of variability in the data.