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H&R Block, Inc., or H&R Block, is an American tax preparation company operating in Canada, the United States, and Australia. The company was founded in 1955 by brothers Henry W. Bloch and Richard Bloch . As of 2018, H&R Block operates approximately 12,000 retail tax offices staffed by tax professionals worldwide.
When a molecule of DNA is double stranded, as DNA usually is, the two strands run in opposite directions. Therefore, one end of the molecule will have the 3' end of strand 1 and the 5' end of strand 2, and vice versa in the other end. However, the fact that the molecule is two stranded allows numerous different variations. Blunt ends
During meiosis, homologous recombination can produce new combinations of genes as shown here between similar but not identical copies of human chromosome 1. Homologous recombination is a type of genetic recombination in which genetic information is exchanged between two similar or identical molecules of double-stranded or single-stranded ...
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Recombinant adeno-associated virus ( rAAV) based genome engineering is a genome editing platform centered on the use of recombinant AAV vectors that enables insertion, deletion or substitution of DNA sequences into the genomes of live mammalian cells. The technique builds on Mario Capecchi and Oliver Smithies ' Nobel Prize –winning discovery ...
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Helix focuses on personal genomics and citizen science. [1] [2] Helix has a marketplace that offers applications created by approved partners. Helix handles sample collection, DNA sequencing, and secure data storage and partners develop on-demand products. Helix is headquartered in the San Francisco Bay Area and operates a sequencing laboratory ...