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Effect of 20 mM serine isomers and D-proline on SRR and DAO immunoreactivity relative to β-actin in C6 cells. A: Increased SRR in cells after a 48-hr exposure to L-serine. B: No effect of L-serine on DAO expression. C: Increased SRR expression in cells after a 48-hr exposure to D-serine. D:No effect of D-serine on DAO. The administration of D-proline (20 mM) to cells did not alter SRR (E) or DAO (F). *P < 0.01
