caption: The image shows a formalin/PFA-fixed paraffin-embedded section of a human body stained with anti-PFA1 antibody [EPR22828] and BSA, which is a type of immunohistochemistry formalin-Pfa1 antibody (epr22828) that has been immunocytochemistry/ immunofluorescence with an anti-BSA antibody (BSA) and azide free ab24747.