Laurence H. Kedes

Learn More
We have built a knowledge-based genetic engineering simulation system-- GENESIS-- capable of representing both domain-specific and general knowledge. Information is stored within a hierarchically-organized framework composed of structures called units. A series of sophisticated editors enables no-computer specialist molecular geneticists to construct a(More)
Perspectives A dvances in technology have made it possible to sequence a whole human genome [1,2]. National and international funding initiatives have stimulated whole-genome research activities [3,4], and media coverage of both the science [5,6] and the emerging commercial offerings [7,8] related to genome research has heightened public awareness and(More)
Histone genes have been cloned selectively in Escherichia coli directly from unfractionated sea urchin DNA using labelled mRNA probe. The cloning method used is potentially applicable for isolating any genetic sequence for which a probe is available. The several eukaryotic gene fragments introduced into bacteria by this method collectively contain all or(More)
The set of histone genes that are active late in embryogenesis of the sea urchin (Strongylocentrotus purpuratus) are present in 5-12 copies per genome and, unlike the clustered, tandemly arrayed early histone genes, are dispersed and irregularly arranged. Late H2B gene expression is activated by events accompanying fertilization and its mRNAs a, first(More)
We have discovered in animal cells a novel class of dispersed, solitary genetic elements derived from tandem multigene families. We refer to such displaced elements as orphons. Orphons arise from both protein-coding and non-protein-coding structural gene families, including those of histone and ribosomal genes. Southern transfer hybridization experiments,(More)
Sea urchin (S. purpuratus) histone DNA of constructed plasmid chimeras cloned in E. coli was cleaved with the restriction endonucleases Eco RI, Hind III, Sal I. Bam I, and Hha I. The resulting fragments were ordered and isolated directly from agarose gels or cloned into other plasmids. Each fragment hybridized to one or another of the five histone mRNAs and(More)
This paper describes briefly the BIONET National Computer Resource for Molecular Biology. This presentation is intended as information for scientists in molecular biology and related disciplines who require access to computational methods for sequence analysis. We describe the goals, and the service and research opportunities offered to the community by(More)