Over 100 research laboratories worldwide conduct studies of the samples; approximately 500 samples are prepared and sent to investigators every year.
ˌoʊvɚ wˈʌnhˈʌndɹɪd ɹᵻsˈɜːtʃ lˈæbɹətˌɔːɹiz wˈɜːldwaɪd kˈɑːndʌkt stˈʌdiz ʌvðə sˈæmpəlz; ɐpɹˈɑːksɪmətli fˈaɪvhˈʌndɹɪd sˈæmpəlz ɑːɹ pɹɪpˈɛɹd ænd sˈɛnt tʊ ɪnvˈɛstᵻɡˌeɪɾɚz ˈɛvɹi jˈɪɹ.