A Comparison of the Native Adult Subunit of Human Hemoglobin (image) Rice University Share Print E-Mail Caption A comparison of the native adult subunit of human hemoglobin, left, and a mutant version found in the Kirklareli variant, which is associated with iron deficiency and increased carbon monoxide binding. The mutation was found to cause mild anemia in a young woman. But her father, who also carries the mutation, appears to be protected by carbon monoxide ingested while smoking. Credit Olson Lab/Rice University Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.