Abstract
Sheep choroid plexus (SCP) cells have been subcultured more than 120 times and have undergone over 300 cell generations. These fibroblastic-appearing SCP II-B cells contain ovine-specific antigens, have an absolute plating efficiency of 23 to 28% and are as susceptible to visna virus infection and virus-induced cytopathology as their low passage level counterparts. Cultures of low, relatively high and high passage level SCP cells produced equivalent amounts of visna virus at similar rates when infected with equal amounts of visna virus. The passage level of the SCP II-B cells, their elapsed number of cell generations, their possession of ovine-specific antigens and their full susceptibility to visna virus allow these cells to be considered an established line of sheep cells.
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