Hasharon

Hemoglobin Hasharon (α247 his(CD5)β2): Comprises 16-19% of hemosylates of carriers. Heterozygotes only have mild, compensated hemolytic anemia. Hb Hasharon is more heat-labile than Hb A, S, or C and perhaps it's instability in vivo leads to denaturation.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC322291/