skin:kertain::blood ?
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skin:kertain::blood: haemoglobin
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The missing thing is haemoglobin.
The correct sequence is skin:keratin::blood: haemoglobin.
It is an iron-containing metalloprotein that is helped in transporting Oxygen in RBCs of all the vertebrates along with tissues of the some invertebrates.
Haemoglobin, which is an essential component of the blood, carries oxygen from gills or lungs to rest parts of body.
The iron of the haemoglobin holds the oxygen.
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