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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.
R-loop. An R-loop is a three-stranded nucleic acid structure, composed of a DNA: RNA hybrid and the associated non-template single-stranded DNA. R-loops may be formed in a variety of circumstances and may be tolerated or cleared by cellular components. The term "R-loop" was given to reflect the similarity of these structures to D-loops; the "R ...
H&R Block Tax Software. H&R Block Tax Software, formerly called H&R Block at Home, is a set of software packages for American income tax preparation offered by H&R Block. They are a main competitor of TurboTax and TaxAct. [1] As of 2014, both the online and software versions of the product go by the flagship name, H&R Block. [2]
Nucleic acid hybridization. In molecular biology, hybridization (or hybridisation) is a phenomenon in which single-stranded deoxyribonucleic acid ( DNA) or ribonucleic acid ( RNA) molecules anneal to complementary DNA or RNA. [1] Though a double-stranded DNA sequence is generally stable under physiological conditions, changing these conditions ...
List of Y-STR markers. The Y-STR markers in the following list are commonly used in forensic [1] and genealogical DNA testing . DYS454 is the least diverse, and multi-copy marker DYS464 is the most diverse Y-STR marker. The location on the Y-chromosome of numbered Y-STR markers can be roughly given with cytogenetic localization.
Hybridization probe. In molecular biology, a hybridization probe ( HP) is a fragment of DNA or RNA, usually 15–10000 nucleotides long, which can be radioactively or fluorescently labeled. HPs can be used to detect the presence of nucleotide sequences in analyzed RNA or DNA that are complementary to the sequence in the probe. [1]
A nucleic acid sequence is the order of nucleotides within a DNA (GACT) or RNA (GACU) molecule that is determined by a series of letters. Sequences are presented from the 5' to 3' end and determine the covalent structure of the entire molecule. Sequences can be complementary to another sequence in that the base on each position is complementary ...
H&E is the combination of two histological stains: hematoxylin and eosin. The hematoxylin stains cell nuclei a purplish blue, and eosin stains the extracellular matrix and cytoplasm pink, with other structures taking on different shades, hues, and combinations of these colors. [5] [6] Hence a pathologist can easily differentiate between the ...