Figure 4From: α-thalassaemiaDeletions that cause α+-thalassaemia. The homologous duplication units X, Y and Z in which the α-genes are embedded are indicated as colored boxes. A cross-over between the mis-paired Z boxes during meiosis gives rise to the -α3.7 and αααanti 3.7 chromosomes. Cross-over between misaligned X-boxes give rise to -α4.2 and αααanti 4.2.Back to article page