congener

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Similarly, Pacific cod larvae grow well at a ratio of 1:1, which is lower than required for their Atlantic cogener (Gadus morhua, DHA:EPA > 2:1 (Copeman & Laurel 2010)).
5% (Table 1) indicating that the ELISA assays are relatively insensitive to cogener interference.
The first [five] percent of the run, aka the foreshots or heads, contains large amounts of cogeners, or volatile chemical compounds such as acetone, aldehydes, esters, and fusel oils.