Influence of l-fucose, compounds 1, 2, 3, 4, and 5, on hemagglutination caused by lectin PA-IIL. Used as an illustrative example of the data (images) acquired by a hemagglutination inhibition assay with microscope detection. The images for lectins AFL, RSL, AAL, AOL, and BC2L-C are included in the supplementary material. * Standard. Standard experiment was done anew for every used batch of protein or red blood cells. ** Controls were done anew for every used batch of protein or red blood cells. Positive control: experiment without any inhibitor. Negative control: experiment without lectin PA-IIL.