<s>[INST] Given an abstract text, please determine whether it contains any drug mentions. Provide a 'Yes' or 'No' answer based on the presence or absence of drugs. Abstract Text: Efavaleukin Alfa Is A Novel Il-2 Mutein That Selectively Expands Regulatory T Cells: Phase 1 Results And Rationale For Clinical Investigation In Ulcerative Colitis[/INST] Yes</s>