ANSWERS: 1
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Antibodies are protein molecules that help the body fight infection. Their size is an important characteristic. An antibody is 150 dalton (kDa). This unit measures molecular mass and is equal to the atomic weight of one hydrogen molecule.
Source:
UNC.edu: How many? A Dictionary of Units of Measurement
Dels.NAS.edu: Monoclonal Versus Polyclonal Antibodies (PDF)
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