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 Red blood cell (RBC) has different composition by comparing other biological cells, Especially hemoglobin molecules, oxygen, iron and polypeptide compound complexes are available inside red blood cell. This vector image may helpful you to express that details after licensing it. Remove Watermark   

 This vector illustration is showing chemical polymer anatomy of hemoglobin. If you need use this image for your article, you can remove watermark and download because, it is licensable.  Remove Watermark