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<p>molecules or particles are too large or too hydrophilic to pass through a lipid bilayer even under these conditions, but can be moved across the membrane through <a href="page.php?w=Lipid_bilayer_fusion">fusion</a> or budding of <a href="page.php?w=Lipid_vesicle">vesicles</a>, events which have also been observed for freeze-thaw cycles. This may eventually have led to mechanisms that facilitate movement of molecules to the inside of the protocell (<a href="page.php?w=endocytosis">endocytosis</a>) or to release its contents into the extracellular</p><p>
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