Epigenetics as a source of variation in comparative animal physiology - or - Lamarck is lookin' pretty good these days.

Abstract excerpt

Considerable variation is inherent both within and between comparative physiological data sets. Known sources for such variation include diet, gender, time of day and season of experiment, among many other factors, but a meta-analysis of physiological studies shows that surprisingly few studies report controlling for these factors. In fact, less than 3% of comparative physiological papers mention epigenetics....

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