The half life time of n radioactive substance is 30aca
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The present invention relates to in vivo serum stability or circulation half-life is improved ... serum stability has a short period or short circulating half-life in vivo. ... Polyethylene glycol (PEG) is bound to a substance on the protein so that the ..... polypeptide or peptide is linked to the N-terminus of Tf, Tf is connected to the ...
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