Adult mouse liver cells obtained by enzymatic dispersion were maintained in primary cultures for up to 4 weeks. They retained some of the typical morphological and ultrastructural characteristics of hepatocytes. After 2 days of culture, structures similar to bile canaliculi were found and after 6 days clusters of small proliferating cells were noticed in the gaps of the monolayer formed by large well-spread hepatocytes. Almost all 3-day cultures began to secrete alphafetoprotein for about 2 weeks, whereas albumin was secreted throughout the period of culture.
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