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Temporal analysis of p57 expression in astrocytoma cell clones in the uninduced and induced states. Without induction, there is no expression of p57 in U343 astrocytoma cells (uninduced). After induction, p57 is strongly expressed in U343C9 and U373C3 astrocytoma cell clones on day 1, and in U87C3 cells on day 3. High expression levels of p57 for all cell clones could be maintained for periods longer than 9 days after induction. A specimen of human fetal brain is shown to express p57.
