The most abundant protien in the living world is
PEPcase of plants and keratin of animals
Ribozyme of plants and collagen of animals
Alcohol dehydrogenase of plants and melanin of animals
RuBisCO of plants and collagen of animals
As we have learned
Most abundant protein in the whole biosphere -
Ribulose bisphosphate carboxylase oxygenase (RuBisCo)
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RuBisCO is the most abundant protien on earth