<p>Firstly, phenylethylamine (PEA) diffuses through the outer membrane of <em>Escherichia coli</em> into the periplasmic space, where it interacts with TynA.</p>
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formula 1.1: <MathJax.Nodeformula={`{PEA_{gut}\\overset{k_{\\text{diff}}\\_{\\text{PEA}}}{\\underset{k_{\\text{diff}}\\_{\\text{PEA}}}{\\rightleftharpoons}} PEA_{peri}}`}/>