"Holoprosencephaly Type 1"^^ . "Holoprosencephaly Type 1"^^ . "The most severe form of holoprosencephaly in which there is a complete absence of midline forebrain division resulting in the presence of fused hemispheres and a single ventricle (alobar holoprosencephaly). It is mapped to chromosome 21q22.NCI" . "C1856096"^^ . "Holoprosencephaly Type 1PTNCI" . . "C75476"^^ . "Holoprosencephaly_Type_1"^^ . "Holoprosencephaly 1SYNCI" . . "Disease or Syndrome"^^ . .