B53 Bomb
B53 or B-53 may refer to : * B53 nuclear bomb * HLA-B53, an HLA-B serotype * Convair XB-53 The Convair XB-53 was a proposed jet-powered medium bomber aircraft, designed by Convair for the United States Army Air Forces. With a radical tailless, forward-swept wing design, the aircraft appeared futuristic; however, the project was ca ...

B53 Nuclear Bomb
The Mk/B53 was a high-yield bunker buster thermonuclear weapon developed by the United States during the Cold War. Deployed on Strategic Air Command bombers, the B53, with a yield of 9 megatons, was the most powerful weapon in the U.S. nuclear arsenal after the last B41 nuclear bombs were retired in 1976. The B53 was the basis of the W-53 warhead carried by the Titan II Missile, which was decommissioned in 1987. Although not in active service for many years before 2010, fifty B53s were retained during that time as part of the "hedge" portion of the Enduring Stockpile until its complete dismantling in 2011. The last B53 was disassembled on 25 October 2011, a year ahead of schedule. With its retirement, the largest bomb currently in service in the U.S. nuclear arsenal is the B83, with a maximum yield of 1.2 megatons. The B53 was replaced in the bunker-busting role by the B61 Mod 11. History Development of the weapon began in 1955 by Los Alamos National Laboratory, base ...
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HLA-B53
HLA-B53 (B53) is an HLA- B serotype A serotype or serovar is a distinct variation within a species of bacteria or virus or among immune cells of different individuals. These microorganisms, viruses, or cells are classified together based on their surface antigens, allowing the epi .... The serotype identifies the more common HLA-B*53 gene products. The B53 sequence is identical to B35 but short sequence specifies a Bw4 rather than a Bw6 motif (as found in B35), indicating B53 is a recent product of gene conversion. This suggests an origin for HLA-B53 involving a gene conversion of HLA-B35 by an allele containing this Bw4 sequence. (For terminology help see: HLA-serotype tutorial) Serotype B*5301 allele frequencies Haplotype frequencies Despite its low frequency, the A36-Cw4-B53 haplotype is one of the most common A-Cw-B haplotypes, as it is the 4th most common in African Americans. References {{DEFAULTSORT:Hla-B53 5 ...
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