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Koichi Miyagawa; Yoshimitsu Hayashi; Shigekazu Kurihara; Akiko Maeda. (2008). Co-administration of <span class="smallCaps">l</span>-cystine and <span class="smallCaps">l</span>-theanine enhances efficacy of influenza vaccination in elderly persons: Nutritional status-dependent immunogenicity. , 8(4), 243–250. doi:10.1111/j.1447-0594.2008.00483.x 
10.1111/j.1447-0594.2008.00483.x