You know what it looks like… but what is it called?
TAKE THE QUIZ“hepatitis B surface”
We have one entry that includes the term hepatitis B surface.
hepatitis B surface antigen
noun: an antigen that is usually a surface particle from the hepatitis B virus and that is found circulating in the blood serum especially of infected individuals —abbreviation HBsAg
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Merriam-Webster unabridged