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. 2022 Mar 28;23(7):3694. doi: 10.3390/ijms23073694

Figure 4.

Figure 4

Surface expression of ACE2 in viable motile human spermatozoa selected by the swim-up procedure as evaluated by flow cytometry. Typical histograms of fluorescence intensity (FL2-H) in spermatozoa incubated with (A) a non-specific serum from non-immunized goat (negative control) or (B,C) two representative sperm samples incubated with primary goat antibody against human ACE2 (anti-ACE2-3 polyclonal antibody, R&D Systems, AF933).