Deletion of Orphon

Comment: A valid concept in genetics, in particular in immunogenetics - http://www.imgt.org/IMGTindex/orphon.phphttps://books.google.com/books?id=MgvpBwAAQBAJ&pg=PA126&dq=orphon&hl=en&sa=X&ved=0ahUKEwj-1_fvvo7hAhVQURUIHfHYBhkQ6AEILDAA#v=onepage&q=orphon&f=falsehttps://books.google.com/books?id=fF8d3eZ6SZ8C&pg=PA33&dq=orphon&hl=en&sa=X&ved=0ahUKEwj-1_fvvo7hAhVQURUIHfHYBhkQ6AEINTAC#v=onepage&q=orphon&f=falsehttps://books.google.com/books?id=mp2qBDlMWlUC&pg=PA185&dq=orphon&hl=en&sa=X&ved=0ahUKEwj-1_fvvo7hAhVQURUIHfHYBhkQ6AEIOjAD#v=onepage&q=orphon&f=false. There are research papers on it - https://www.ncbi.nlm.nih.gov/pubmed/?term=%22orphon%22 and should satisfy . The article is no longer just a dictionary definition and it can still be expanded, so the rationale for the AfD no longer applies
Stance: keep
Cited policy: Wikipedia:Notability (WP:GNG)