Let me introduce Erythrocruorin, giant hemoglobin made from earthworms. This hemoglobin is HUGE, it is comprised of 144 globin chains and its skeleton is comprised of 12 globin chains. Each of these chains can carry oxygen and with its 3-fold symmetry, the real reason I noticed it, it kinda acts like a rock tumbler or a rattler. The oxygen rattle around bonding randomly in its skeleton structure but never being allowed to escape. Maybe this is more like one of those cat/dog toys containing a treat. Tell me what you think!
Our dog has one of those chew toys. I had never drawn the connection to earthworm hemoglobin, but now that you point this out to us I will view my dog’s chewing in a new light.