Verschuer wrote in the report that the war conditions had made it difficult for the KWIfA to procure "twin materials" for study, and that Mengele's unique position at Auschwitz offered a special opportunity in this respect. In the summer of 1944, Mengele and his Jewish slave assistant Dr. Miklós Nyiszli sent other "scientific materials" to the KWIfA, including the bodies of murdered Gypsies, internal organs of dead children, skeletons of two murdered Jews, and blood samples of twins infected by Mengele with typhus.