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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Early initiation of DNA synthesis in G1 phase HeLa cells following fusion with red cell ghosts loaded with S-phase cell extracts.

A modification of polyethylene glycol-mediated cell fusion procedure has been described and standardized for red blood cell mediated microinjection of proteins into cells in suspension. Using this procedure, proteins are routinely introduced into 50% of the target cells. We have applied this microinjection procedure to introduce cytoplasmic extracts obtained from S-phase HeLa cells into HeLa cells synchronized in G1. This experiment resulted in an accelerated entry of the G1 cells into S phase as measured by the incorporation of [3H]thymidine. This technique may provide a means to identify and characterize the S-phase factors responsible for the induction of DNA synthesis.[1]


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