FIG. 8.

In vitro contributions of PE biosynthetic pathways. Primary hepatocytes were incubated with [¹⁴C]ethanolamine or [³H]serine as described in Materials and Methods. Data shown for the synthesis of [¹⁴C]PE, [¹⁴C]PC, [¹⁴C]phosphoethanolamine, and [¹⁴C]CDP-ethanolamine (A to D) are values after ethanolamine incubation. Data shown for the synthesis of [³H]PE and [³H]PC (E and F) are values after [³H]serine incubation. All data are means ± standard errors of the means and are representative of at least two livers for experiments performed in triplicate. *, P < 0.01.