Assertion: hemoglobin | /r/HasAspect | molecular weight of 68,000 da
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Source sentences:
text: Through a series of experiments utilizing the sedimentation equilibrium technique, two important observations were made: hemoglobin has a molecular weight of 68,000 Da, suggesting that there are four iron atoms present rather than one, and that no matter where the hemoglobin was isolated from, it had exactly the same molecular weight.