More than 430 abnormal haemoglobins have been described. The majority result from point mutations in the globin genes.
Examples include:
Hb type  | Point Mutation  | Consequence  | 
HbS  | beta-6  | sickle cell disease  | 
HbC  | beta-6  | |
HbE  | beta-26  | |
HbM Boston  | beta-58  | methaemoglobinaemia  | 
HbM Saskatoon  | beta-63  | methaemoglobinaemia  | 
Constant Spring  | alpha-141  | alpha thalassaemia  | 
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