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<p>a stoma. Over the stoma, a <a href="page.php?w=hypha">hypha</a>l tip produces an infection structure called an <a href="page.php?w=appressorium">appressorium</a>. From the underside of an appressorium, a slender hypha grows downward to infect plant cells. It is thought that the whole process is mediated by stretch-sensitive <a href="page.php?w=calcium_channel">calcium ion channels</a> located in the tip of the hypha, which produce electric currents and alter <a href="page.php?w=gene_expression">gene expression</a>, inducing appressorium formation.</p><p>
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