H2A (other)
H2A, H-2A or H-IIA can refer to: *Histone H2A, a component of DNA higher structure in eukaryotic cells *H-IIA, a family of Japanese rockets. *H-2A Visa, a temporary, nonimmigrant visa allowing foreign nationals entry into the U.S. The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

Histone H2A
Histone H2A is one of the five main histone proteins involved in the structure of chromatin in eukaryotic cells. The other histone proteins are: H1, H2B, H3 and H4. Background Histones are proteins that package DNA into nucleosomes. Histones are responsible for maintaining the shape and structure of a nucleosome. One chromatin molecule is composed of at least one of each core histones per 100 base pairs of DNA. There are five families of histones known to date; these histones are termed H1/H5, H2A, H2B, H3, and H4. H2A is considered a core histone, along with H2B, H3 and H4. Core formation first occurs through the interaction of two H2A molecules. Then, H2A forms a dimer with H2B; the core molecule is complete when H3-H4 also attaches to form a tetramer. Sequence variants Histone H2A is composed of non-allelic variants. The term "Histone H2A" is intentionally non-specific and refers to a variety of closely related proteins that vary often by only a few amino acids. Apart ...
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H-IIA
H-IIA (H-2A) is an active expendable launch system operated by Mitsubishi Heavy Industries (MHI) for the Japan Aerospace Exploration Agency. These liquid fuel rockets have been used to launch satellites into geostationary orbit; lunar orbiting spacecraft; '' Akatsuki'', which studied the planet Venus; and the Emirates Mars Mission, which was launched to Mars in July 2020. Launches occur at the Tanegashima Space Center. The H-IIA first flew in 2001. , H-IIA rockets were launched 45 times, including 39 consecutive missions without a failure, dating back to 29 November 2003. Production and management of the H-IIA shifted from JAXA to MHI on 1 April 2007. Flight 13, which launched the lunar orbiter SELENE, was the first H-IIA launched after this privatization. The H-IIA is a derivative of the earlier H-II rocket, substantially redesigned to improve reliability and minimize costs. There have been four variants, with two in active service (as of 2020) for various purposes. A ...
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H-2A Visa
An H-2A visa allows a foreign national worker into the United States for temporary agricultural work. There are several requirements of the employer in regard to this visa. The H-2A temporary agricultural program establishes a means for agricultural employers who anticipate a shortage of domestic workers to bring non-immigrant foreign workers to the U.S. to perform agricultural labor or services of a temporary or seasonal nature. In 2015 there were approximately 140,000 total temporary agricultural workers under this visa program. Terms of work can be as short as a month or two or as long as 10 months in most cases, although there are some special procedures that allow workers to stay longer than 10 months. All of these workers are covered by U.S. wage laws, workers' compensation and other standards; additionally, temporary workers and their employers are subject to the employer and/or individual mandates under the Affordable Care Act. Because of concern that guest workers migh ...
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