Endocytosis. For example, coronavirus binds to the ACE2 receptor of the epithelial cell. Science consultant - Valerya Arkhipova. Protein Data Bank:
<ul><li>6vsb protein spike</li>
<li>2mls membrane bilayers</li>
<li>6m17 Structural basis for the recognition of SARS-CoV-2 by full-length human ACE2</li>
<li>6bqn Structure of the human epithelial sodium channel by cryo-electron microscopy.</li>
<li>2bvk The polysaccharide hyaluronan (HA) is a ubiquitous component of the vertebrate extracellular matrix with diverse physiological roles from space-filling to acting as a scaffold for other macromolecules.</li>
<li>7a5o Human MUC2</li>
<li>6y3y  Human Coronavirus HKU1 Haemagglutinin-Esterase</li>
<li>5x29 E protein pentameric ion channel</li>
<li>6yyt replicating SARS-CoV-2 polymerase</li></ul><p>Primary sources:
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<ul><li><a rel="nofollow" class="external free" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7489918/">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7489918/</a></li>
<li><a rel="nofollow" class="external free" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7098027/">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7098027/</a></li>
<li><a rel="nofollow" class="external free" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7605623/">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7605623/</a></li></ul>
<a href="//commons.wikimedia.org/wiki/User:AlexeySolodovnikov" title="User:AlexeySolodovnikov">Alexey Solodovnikov</a> (Idea, Producer, CG, Editor), <a href="//commons.wikimedia.org/w/index.php?title=User:Valerarkhipova&amp;action=edit&amp;redlink=1" class="new" title="User:Valerarkhipova (page does not exist)">Valeria Arkhipova</a> (Scientific Сonsultant)
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<span class="int-own-work" lang="en">Own work</span>