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Example sentences for: tkt
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The astrocyte lineage of the LTR lines has been published [ 6 13 ] . The astrocyte lineage of the tkT lines was confirmed by the presence of the astrocyte-specific intermediate filament protein, GFAP [ 14 ] (Figure 1).
Characterization of tkT lines
Lysates from equal numbers of cells were loaded on the electrophoresis gel with the exception of P0-13D tkT#13, which expressed the lowest levels of Tag.
To test this, the cell line in which Tag control was most sensitive to density, P0-3D tkT#5, was grown for 3 days starting at an intermediate density of 10 6cells per 10 cm plate with varying concentrations of serum ranging from 2.5-10%.
Cortical astrocytes were harvested from neonatal C57BL/6 mice and infected with a replication-defective retrovirus encoding Tag and neomycin resistance as previously described [ 13 ] . The transferred viruses were SV40-6 [ 5 ] , in which wild type Tag is expressed from the M-MuLV LTR promoter; SV(X)T K1, which is constructed the same as SV40-6 except that the Tag is mutant [ 38 ] and defective for binding the retinoblastoma protein family [ 39 ] ; Linker-tkT, in which the cDNA for Tag is expressed from the herpes simplex 1 tk promoter [ 11 ] . The differentiation and transformation phenotypes of the cell lines utilizing the M-MuLV LTR promoter have been described [ 6 13 ] . The Linker-tkT lines (tkT) were either isolated as clones after G418 selection (as previously described) [ 6 ] or frozen immediately after selection (pooled clones) and clonally selected at a later time.