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Overview of the different classes of probes with a size comparison. Depicted are small cell wall probe (CWP), carbohydrate-binding module (CBM), single chain variable fragment (scFV) and immunoglobulin G (IgG) structure with indicated regions and size in kDa. The structure of M13 phage with indicated capsid structural proteins (pIII, pIV, pVII, pVIII, pIX). The content of the dashed square indicates the real-size relation of immunoglobulins IgG and IgM to the M13 phage.
