Enzyme-linked immunosorbent assay (ELISA) studies of the interaction between mammalian and avian anti-thermogenin antibodies and brown-adipose-tissue mitochondria from different species. 
Three different antibody preparations, rabbit anti-hamster and rabbit anti-rat thermogenin sera and chicken anti-rat thermogenin IgG, were tested for cross-reactivity towards isolated thermogenin and BAT mitochondria from different mammalian species using an ELISA-technique.  It was found that the antibody preparations readily cross-reacted with different species, but that the affinity of the antibody preparations was greater towards the homologous species than the other species.  The reactivity of an antibody preparation towards mitochondria from different tissues from the homologous species was also tested, and the exclusive occurrence of thermogenin in BAT could be confirmed.