In prior studies of the impact of a plant - based diet, there were several limitations. (sciencedaily.com)
However, this delivery protein does not exist in mice, rats or other animals used in prior studies with the compound. (sciencenewsforstudents.org)
Even with this careful attention to selection bias, we confirm the findings of prior studies showing that teachers with master's degrees are no more effective than those without. (caldercenter.org)