"If everything has gone well the link will be blue (once you are no longer in edit mode). If you have created a link to a not-yet-existing article it will be grey. Don't worry, as soon as that article is created, your link will turn blue."
""Links to other Web sites should not be posted by users, except when in the form of a link to a reference textbook or journal in the reference field of articles. This site reserves the right to remove any and all links from any part of the site and posted by any user without consultation.""
"In general, this also applies to italics, with the sole exception that binomial organism names, e.g. Escherichia coli, should be italicised and therefore if a link is added it will be italicised."
Expected headings
"Blue links and grey links"
"Link style"
"Bold, italics, and headings"
"Multiple links"
"Acronyms in links"
"How to create a link"
"Grammarly issue"
"External links"
"Requirements"
"Unacceptable external links"
"In any case, external links require special approval by our editorial board and their decision is final; factors considered include:"