ðɛɹ hiː dɪvˈɛləpt ðə fˈɛɹɪtˌɪnˈæntɪbˌɑːdi, wˌɪtʃ wʌzðə fˈɜːst ᵻlˈɛktɹɑːndˈɛns ɹɪˈeɪdʒənt jˈuːzd fɔːɹ sˈɛl stˈeɪnɪŋ ɪn ᵻlˈɛktɹɑːn mˈaɪkɹəskəpi ˈɪmɪdʒɪŋ.
There he developed the ferritin-antibody, which was the first electron-dense reagent used for cell staining in electron microscopy imaging.