a limiting amount of isolated human hemoglobin alpha chains was incubated with a mixture containing excess , but equal , amounts of beta a and beta s chains to form hemoglobin s = alpha 2 beta 2s and hemoglobin = alpha 2 beta 2a , presumably by the reaction 2 alpha + 2 beta leads to 2 alpha beta leads to alpha 2 beta 2 .
C0019016
a
C0019046
hemoglobin