R. Peek

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We have investigated the methylation state of the rat gamma-crystallin genes in DNA from lens cells at different developmental stages as well as from kidney and heart cells. A clear correlation between the extent of demethylation of the promoter and 5' gene regions and the expression of these genes was observed. No change in the methylation state of the far(More)
The subcellular distribution of Ro ribonucleoprotein particles (Ro RNPs) and their constituents was determined using mammalian tissue culture cells and Xenopus laevis oocytes. Cell fractionation revealed that Ro RNPs are restricted to the cytoplasm, while the Ro RNP-specific proteins were also present in the nucleus. Transport studies indicated that the(More)
1. MOTIVATION It is known that if L n , respectively R n9 are n x n matrices with the (/, j) * entry the binomial coefficient (y~l) ? respectively (^l)), then L 2 n = I n (mod 2), respectively R " =I n (mod 2), where I n is the identity matrix of dimension n>\ (see, e.g., Problem PI 073 5 in the May 1999 issue of Arner. Math Monthly). The entries of L n(More)
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