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[DOI] [PubMed] [Google Scholar] 94.Kameyama K., Sakai C., Kondoh S., Yonemoto K., Nishiyama S., Tagawa M., Murata T., Ohnuma T., Quigley J., Dorsky A., et al

OCTN2 is differentially expressed in various tissues and plays a major role in regulating carnitine levels within these tissues

It depends entirely on your concentration

Timmons L, Court DL, Fire A (2001) Ingestion of bacterially expressed dsRNAs can produce specific and potent genetic interference in Caenorhabditis elegans