Anti Bodies
A secondary antibody is an antibody that

is produced in boostered animals
binds to another antibody
has been used in prior experiments
is synthetically produced

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Anti Bodies
Each IgA antibody molecule consists of

three polypeptide chain and has two antigen binding site
two polypeptide chain and has one antigen binding site
two polypeptide chain and has two antigen binding site
four polypeptide chain and has two antigen binding site

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