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. 2021 Aug 16;8:677001. doi: 10.3389/fmed.2021.677001

Figure 2.

Figure 2

Fetal tissues immunostained for SARS-CoV-2 spike protein (SP) (green) counterstained with nuclear marker DAPI (blue). Images were acquired with a confocal microscope Leica TCS SP8 using a × 63 objective lens. Scale bar for all pictures is 50 μm. Top pictures: pulmonary immunodetection of SP (the three on the left) and negative control of immunofluorescence without primary antibody (right) in the present case. Lower images: immunodetection of SP in the brain and heart of this case (the two on the left), negative control immunofluorescence without primary antibody in a section of the brain, and lack of immunodetection of SP in a non-COVID fetal lung (right).