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. 2016 Feb 9;6:20811. doi: 10.1038/srep20811

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(a) Calculated ratio (I₁₀₀₄ + I₉₆₀)/I₁₆₆₀ for ARPE-19 cells grown in l-Phe and l-Phe(D8) culture media. (b) Computed difference Raman spectra acquired from cells cultured in l-Phe and l-Phe(D8) daily for 7 days. Spectra are shifted vertically for clarity.