Before revision: Immunofluorescent techniques that utilized labelled antibodies was conceptualized in the 1940’s by Albert H. Coons.280x280px|Photomicrograph of a histological section of human skin prepared for direct immunofluorescence using an anti-IgG antibody.
After revision: Immunofluorescent techniques that utilized labelled antibodies was conceptualized in the 1940s by Albert H. Coons.280x280px|Photomicrograph of a histological section of human skin prepared for direct immunofluorescence using an anti-IgG antibody.