Assertion: hemoglobin | /r/MadeOf | 2 alpha-strands
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Source sentences:
text: I read some time ago that while in "higher" animals including humans, 2 strands of alpha-hemoglobin combine with 2 strands of beta-hemoglobin, in "lesser" animals, the hemoglobin consists only of 2 alpha-strands (enclosing, as usual, an iron atom).