Protein abundance in human liver (H) and intestine (I) microsomes. Protein abundance (pmol/mg) of CYPs (A) UGTs (B), and other non-CYPs (C) in different microsomal on-column protein amount ranging from 5–333 ng. Protein amount normalized fractional abundance (%) of CYPs (D), UGTs (E), and other non-CYPs (F). Fractional abundance (%) of CYPs (G), UGTs (H), and other non-CYPs (I) reported as means and standard deviations of the protein normalized abundance values. The protein amount normalized abundance was calculated by dividing the abundance value by the on-column microsomal protein amount. The figure insets are zoomed data for low abundance proteins.