“Min x” followed by a list of species means that the antibody has minimal cross-reactivity against antibodies from those species. The antibody has been adsorbed against serum proteins from the listed species, to ensure that it does not cross-react with those species.
Highly cross-adsorbed antibodies are recommended when doing multiple staining with antibodies from different species (for example, co-staining with two different primary antibodies from mouse and rat hosts) or when staining tissues from species that are closely related to the antibody host (such as using mouse antibodies to stain rat tissue).
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