The transgene contains sequences encoding the human proteins HBA1 (hemoglobin, alpha 1), HBG2 (hemoglobin, gamma G, fetal component), HBG1 (hemoglobin, gamma A, fetal component), HBD (hemoglobin, delta), and HBB S (hemoglobin, beta, sickle allele), and the locus control region (LCR). The HBBS allele contains an A to T transversion mutation in the sixth codon of HBB which causes an amino acid change from Glu to Val. The transgene promoter is multiple: from alpha and beta globin human loci. Transgenic mice express human alpha hemoglobin, gamma hemoglobin, and sickle cell hemoglobin.