          ↓                                     ↑                 Phenylalanine, tyrosine, and tryptophan biosynthesis   00   00.00                  000.0000   000.0000     C00000              LPC(00:0)             ↑                  ↓                  ↓                 Phospholipids metabolism   00   00.00                  000.0000   000.0000     HMDB00000           LPE(00:0)             ↓                  ↑                  ↑                 Phospholipids metabolism   00   0.00                   000.000