Pubmed is typically listed as a source for a "whitelist" of reputable journals. This is the case for Journals indexed in MEDLINE, however Pubmed is made up of MEDLINE AND PMC Central (PMC) citations. "PMC is a digital repository for full-text articles. It is vulnerable to infiltration by predatory journal articles because individual authors upload their articles into the database in accordance with funder requirements, even though the journals might not meet the standard for indexing in PubMed. By doing so, individual articles are displayed in both PMC and PubMed, which is concerning because it potentially legitimizes research that has not been appropriately reviewed, and represents a substantial waste of public money being used to pay for publication."