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Closed-up style is avoided in some cases: possible homographs, such as recreation (fun or sport) versus re-creation (the act of creating again), retreat (turn back) versus re-treat (give therapy again), and un-ionized (not in ion form) versus unionized (organized into trade unions); combinations with proper nouns or adjectives (un-American, de-Stalinisation);[2][3] acronyms (anti-TNF antibody, non-SI units); or numbers (pre-1949 diplomacy, pre-1492 cartography). Although proto-oncogene is still hyphenated by both Dorland's and Merriam-Webster's Medical, the solid (that is, unhyphenated) styling (protooncogene) is a common variant, particularly among oncologists and geneticists.[citation needed]