Krogh Nøh, A. et al. Polygenic heterogeneity in antidepressant treatment and placebo response. Translational Psychiatry; https://www.nature.com/articles/s41398-022-02221-4 (2022).

This article is a peer reviewed primary article and can be identified as such due to the structure of the article: introduction, methods, results, and discussion. The study also involves a randomized clinical trial and mentions specific methodologies used, rather than referencing other articles and their findings. This indicates that the data and findings being presented are original, which is a key characteristic of a primary article. Additionally, the article is published in Translational Psychiatry, which is under the Nature portfolio. Nature is known for having a rigorous peer review process and their editorial policies ensure that each article is reviewed for validity and significance.