| ß genotype | XmnI genotype | response to HU |
| Cd6 GAG>GTG/IVS-I-5 G>C (n=7) HBB:c.20A>T/ HBB:c.92+5G>C | T/C (n=2) | Excellent (n=2) Partial (n=0) None (n=0) |
| C/C (n=5) | Excellent (n=1) Partial (n=4) None (n=0) |
|
| Cd6 GAG>GTG/Cd121 GAA>CAA (n=2) HBB:c.20A>T/ HBB:c.364G>C | T/C (n=1) | Excellent (n=1) Partial (n=0) None (n=0) |
| C/C (n=1) | Excellent (n=0) Partial (n=1) None (n=0) |
|
| Cd6 GAG>GTG/Cd44 (-C) (n=1) HBB:c.20A>T/ HBB:c.135delC | T/C (n=1) | Excellent (n=0) Partial (n=1) None (n=0) |
| Cd6 GAG>GTG/IVS-I-1 G>A (n=1) HBB:c.20A>T/ HBB:c.92+1G>A | T/C (n=1) | Excellent (n=0) Partial (n=0) none (n=1) |
| Cd6 GAGGTG/Cd37(-T) (n=1) HBB:c.20A>T/ HBB:c.112delT | C/C (n=1) | Excellent (n=0) Partial (n=1) none (n=1) |