1. Several reproducible differences in polypeptide patterns were observable between the two membrane fractions; in particular, components possibly corresponding to the heavy chain of myosin and to actin were prominent in the bile canalicular membrane fraction.

L'électrophorèse sur gel de dodécyl sulfate de sodium (SDS) polyacrylamide permet de déceler la composition polypeptidique complexe (> 30) des deux fractions membranaires.