ɪn ðɛɹ pæθˈɑːlədʒi lˈæbɹətˌɔːɹi ðeɪ nˈoʊɾᵻd ðæt jˈuːʒuːəli ðɪ ˌɛndoʊkˈɑːɹdiəm wʌz pˈɜːli wˈaɪt ɔːɹ oʊpˈeɪk ɪnstˈɛd ʌv nˈoːɹməli θˈɪn ænd tɹænspˈæɹənt ænd mˌaɪkɹəskˈɑːpɪkli ʃˈoʊd ɐ sˌɪstəmˈæɾɪk lˈeɪɚɹɪŋ ʌv kˈɑːleɪdʒnəs ænd ᵻlˈæstɪk fˈaɪbɚz.
In their pathology laboratory they noted that usually the endocardium was pearly white or opaque instead of normally thin and transparent and microscopically showed a systematic layering of collagenous and elastic fibers.