A coboglobin is a synthetic compound, a

metalloprotein Metalloprotein is a generic term for a protein that contains a metal ion cofactor. A large proportion of all proteins are part of this category. For instance, at least 1000 human proteins (out of ~20,000) contain zinc-binding protein domains a ...

chemically similar to hemoglobin or myoglobin but using the metal

cobalt Cobalt is a chemical element with the symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, pro ...

instead of iron (hence the name). Just like hemoglobin and myoglobin, the coboglobins are able to reversibly bind molecular oxygen (O₂) at the metal atom. However, they lose this ability much faster than the natural

molecules A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion. In quantum physics, organic chemistry, and bioche ...

. Blood of this type would be uncoloured and clear when in the

veins Veins are blood vessels in humans and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated ...

while

amber Amber is fossilized tree resin that has been appreciated for its color and natural beauty since Neolithic times. Much valued from antiquity to the present as a gemstone, amber is made into a variety of decorative objects."Amber" (2004). In Ma ...

yellow in

colour Color (American English) or colour (British English) is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are associa ...

in the

arteries An artery (plural arteries) () is a blood vessel in humans and most animals that takes blood away from the heart to one or more parts of the body (tissues, lungs, brain etc.). Most arteries carry oxygenated blood; the two exceptions are the p ...

References

* *{{cite journal , last1=Marden , first1=Michael C. , title=Modulation of the Oxygen Affinity of Cobalt-Porphyrin by Globin , journal=FEBS Letters , volume=472 , issue=2–3 , date=28 April 2000 , pages=221–224 , pmid=10788615 , doi=10.1016/S0014-5793(00)01423-X, display-authors=etal, hdl=10067/294190151162165141 , s2cid=24995840 , hdl-access=free . Metalloproteins