An article that is undergoing (blank) is read carefully and checked by other scientists

An article that is undergoing peer-review  is read carefully and checked by other scientists.

Explanation:

Peer-review means reviewing the writer academic work, reports or ideas by the people called as experts in the same field before the writer work is published. Peer-review generally takes about 3-4 weeks. There are general 10 steps for the peer-review and they are submission of idea, editorial office assessment, appraisal by editor in chief, editor in chief assign to an associate editor, call for reviewers, invitation response, review of document, review evaluation, decision making, send to publish.