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. 1975 May;72(5):1904-8.
doi: 10.1073/pnas.72.5.1904.

Methylated, blocked 5 termini in HeLa cell mRNA

Y Furuichi, M Morgan, A J Shatkin, W Jelinek, M Salditt-Georgieff, J E Darnell

Methylated, blocked 5 termini in HeLa cell mRNA

Y Furuichi et al. Proc Natl Acad Sci U S A. 1975 May.

Abstract

Poly(A)-containing HeLa cell mRNA prepared from cells labeled with [methyl-(3)H]methionine or [(32)P]phosphate was found to contain a variety of methylated, blocked 5'-terminal structures of two general types: m(7)GpppN(7)-Np and m(7)GpppN(m)-N(m)-Np. In addition, about one-third of the [(3)H]methyl label was present in the N(6)-methyladenosine; this labeled nucleoside was not found in the 3'-terminal one-third of the mRNA chain and thus may also be in the 5' portion of the mRNA.

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