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Example sentences for: smi-
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Both RT-97 and SMI-31 may recognize the phosphorylated tyrosine motif, LNDRFAG Y IDKVR, which occurs in NF-H and thus provides the basis for the claim of these antibodies being specific for phosphorylated NFs [ 14 ] . However, this same motif occurs in GFAP and lamins A, B, and C and possibly other proteins, and is not restricted to neurons as shown by the glial staining reported here and in other studies [ 1 ] . It would be interesting to look at nuclei from a variety of tissue types using these antibodies as probes.
In addition, Shea et al . [ 19 ] , in a study of neurite outgrowth from NB2a cells, showed that both the SMI-31 and RT-97 mABs strongly labeled nuclei of undifferentiated cells, and the nuclear labeling declined as differentiation progressed.
Because of the association of phosphorylated lamins with DNA replication and the cell cycle [ 8 ] , and the sharing of phosphoepitopes among lamins, NFs, and GFAP, it seems most probable that the nuclear epitopes revealed in neuroblastoma and glioma cells by SMI-31 and RT-97 are contained on lamin B.
Therefore it is possible that this sequence constitutes or contains the epitope recognized by the SMI-31 and RT-97 mABs, and may account for the cross-reactivity of these antibodies with respect to NF-H, GFAP, and lamins.
The RT-97 mAB [ 9 ] has been characterized as recognizing phosphorylated epitopes on the 210 kDa NF-H peptide [ 15 ] , and used similarly to SMI-31 to identify neurites in vitro and in situ [ 16 17 18 ] . One would predict, therefore, that labeling with RT97 would produce staining patterns, including nuclear, similar to those of SMI-31 in SH-SY5Y cells.
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