a structural hemoglobin variant of (G)gamma with two amino acid replacements in cis found in the umbilical cord blood of a neonate in Madrid, Spain; two new mutations in cis on (G)gamma chain of fetal hemoglobin: (G gamma 50(D1)Ser to Cys) and (G gamma 75(E19)Ile to Thr); Hb F-Madrid is also available with a different mutation