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Here is the practical comparison researchers rely on

The surface mucus layer is believed to impede the ingress of intact bacteria and large particulates toward the mucosa [8,9,10]

Contemporary approach to joint hypermobility and related disorders

75 They showed that an Simian Immunodeficient Virus (SIV) -specific IC could interact with the FcRIIb receptor on the epithelium lining the cervix and block target cell recruitment
