<P> Another protein, the Rh factor, plays an important part in the grouping of blood . If this is present, the particular blood type is called Rh - positive . If it is absent, it is called Rh - negative . </P> <P> In addition to the ABO and Rh blood group systems, there are more than two hundred minor blood groups that can complicate blood transfusions . These are known as rare blood types . Whereas common blood types are expressed in a letter or two, which may be a plus or a minus, a smaller number of people express their blood type in an extensive series of letters in addition to their AB ± type designation . </P> <P> For example, the h / h blood group, also known as Oh or the Bombay blood group, is a rare blood type . </P> <Table> <Tr> <Th> ISBT No </Th> <Th> System name </Th> <Th> System symbol </Th> <Th> Epitope or carrier, notes </Th> <Th> Chromosome </Th> </Tr> <Tr> <Td> 001 </Td> <Td> ABO </Td> <Td> ABO </Td> <Td> Carbohydrate (N - Acetylgalactosamine, galactose). A, B and H antigens mainly elicit IgM antibody reactions, although anti-H is very rare, see the Hh antigen system (Bombay phenotype, ISBT #18). </Td> <Td> 9q34. 2 </Td> </Tr> <Tr> <Td> 002 </Td> <Td> MNS </Td> <Td> MNS </Td> <Td> GPA / GPB (glycophorins A and B). Main antigens M, N, S, s . </Td> <Td> 4q31. 21 </Td> </Tr> <Tr> <Td> 003 </Td> <Td> </Td> <Td> </Td> <Td> Glycolipid . Three antigens: P, P, and P </Td> <Td> 22q13. 2 </Td> </Tr> <Tr> <Td> 004 </Td> <Td> Rh </Td> <Td> RH </Td> <Td> Protein . C, c, D, E, e antigens (there is no "d" antigen; lowercase "d" indicates the absence of D). </Td> <Td> 1p36. 11 </Td> </Tr> <Tr> <Td> 005 </Td> <Td> Lutheran </Td> <Td> LU </Td> <Td> Protein (member of the immunoglobulin superfamily). Set of 21 antigens . </Td> <Td> 19q13. 32 </Td> </Tr> <Tr> <Td> 006 </Td> <Td> Kell </Td> <Td> KEL </Td> <Td> Glycoprotein . K can cause hemolytic disease of the newborn (anti-Kell), which can be severe . </Td> <Td> 7q34 </Td> </Tr> <Tr> <Td> 007 </Td> <Td> Lewis </Td> <Td> LE </Td> <Td> Carbohydrate (fucose residue). Main antigens Le and Le--associated with tissue ABH antigen secretion . </Td> <Td> 19p13. 3 </Td> </Tr> <Tr> <Td> 008 </Td> <Td> Duffy </Td> <Td> FY </Td> <Td> Protein (chemokine receptor). Main antigens Fy and Fy . Individuals lacking Duffy antigens altogether are immune to malaria caused by Plasmodium vivax and Plasmodium knowlesi . </Td> <Td> 1q23. 2 </Td> </Tr> <Tr> <Td> 009 </Td> <Td> Kidd </Td> <Td> JK </Td> <Td> Protein (urea transporter). Main antigens Jk and Jk . </Td> <Td> 18q12. 3 </Td> </Tr> <Tr> <Td> 010 </Td> <Td> Diego </Td> <Td> DI </Td> <Td> Glycoprotein (band 3, AE 1, or anion exchange). Positive blood is found only among East Asians and Native Americans . </Td> <Td> 17q21. 31 </Td> </Tr> <Tr> <Td> 011 </Td> <Td> Yt </Td> <Td> YT </Td> <Td> Protein (AChE, acetylcholinesterase). </Td> <Td> 7q22. 1 </Td> </Tr> <Tr> <Td> 012 </Td> <Td> XG </Td> <Td> XG </Td> <Td> Glycoprotein . </Td> <Td> Xp22. 33 </Td> </Tr> <Tr> <Td> 013 </Td> <Td> Scianna </Td> <Td> SC </Td> <Td> Glycoprotein . </Td> <Td> 1p34. 2 </Td> </Tr> <Tr> <Td> 014 </Td> <Td> Dombrock </Td> <Td> DO </Td> <Td> Glycoprotein (fixed to cell membrane by GPI, or glycosyl - phosphatidyl - inositol). </Td> <Td> 12p12. 3 </Td> </Tr> <Tr> <Td> 015 </Td> <Td> Colton </Td> <Td> CO </Td> <Td> Aquaporin 1 . Main antigens Co (a) and Co (b). </Td> <Td> 7p14. 3 </Td> </Tr> <Tr> <Td> 016 </Td> <Td> Landsteiner - Wiener </Td> <Td> LW </Td> <Td> Protein (member of the immunoglobulin superfamily). </Td> <Td> 19p13. 2 </Td> </Tr> <Tr> <Td> 017 </Td> <Td> Chido </Td> <Td> CH </Td> <Td> C4A C4B (complement fractions). </Td> <Td> 6p21. 3 </Td> </Tr> <Tr> <Td> 018 </Td> <Td> Hh </Td> <Td> </Td> <Td> Carbohydrate (fucose residue). </Td> <Td> 19q13. 33 </Td> </Tr> <Tr> <Td> 019 </Td> <Td> XK </Td> <Td> XK </Td> <Td> Glycoprotein . </Td> <Td> Xp21. 1 </Td> </Tr> <Tr> <Td> 020 </Td> <Td> Gerbich </Td> <Td> GE </Td> <Td> GPC / GPD (Glycophorins C and D). </Td> <Td> 2q14. 3 </Td> </Tr> <Tr> <Td> 021 </Td> <Td> Cromer </Td> <Td> CROM </Td> <Td> Glycoprotein (DAF or CD55, regulates complement fractions C3 and C5, attached to the membrane by GPI). </Td> <Td> 1q32. 2 </Td> </Tr> <Tr> <Td> 022 </Td> <Td> Knops </Td> <Td> KN </Td> <Td> Glycoprotein (CR1 or CD35, immune complex receptor). </Td> <Td> 1q32. 2 </Td> </Tr> <Tr> <Td> 023 </Td> <Td> Indian </Td> <Td> IN </Td> <Td> Glycoprotein (CD44 adhesion function?). </Td> <Td> 11p13 </Td> </Tr> <Tr> <Td> 024 </Td> <Td> Ok </Td> <Td> OK </Td> <Td> Glycoprotein (CD147). </Td> <Td> 19p13. 3 </Td> </Tr> <Tr> <Td> 025 </Td> <Td> Raph </Td> <Td> RAPH </Td> <Td> Transmembrane glycoprotein . </Td> <Td> 11p15. 5 </Td> </Tr> <Tr> <Td> 026 </Td> <Td> JMH </Td> <Td> JMH </Td> <Td> Protein (fixed to cell membrane by GPI). Also known as Semaphorin 7A or CD108 . </Td> <Td> 15q24. 1 </Td> </Tr> <Tr> <Td> 027 </Td> <Td> Ii </Td> <Td> </Td> <Td> Branched (I) / unbranched (i) polysaccharide . </Td> <Td> 6p24. 2 </Td> </Tr> <Tr> <Td> 028 </Td> <Td> Globoside </Td> <Td> GLOB </Td> <Td> Glycolipid . Antigen P . </Td> <Td> 3q26. 1 </Td> </Tr> <Tr> <Td> 029 </Td> <Td> GIL </Td> <Td> GIL </Td> <Td> Aquaporin 3 . </Td> <Td> 9p13. 3 </Td> </Tr> <Tr> <Td> 030 </Td> <Td> Rh - associated glycoprotein </Td> <Td> RHAg </Td> <Td> Rh - associated glycoprotein . </Td> <Td> 6p21 - qter </Td> </Tr> <Tr> <Td> 031 </Td> <Td> Forssman </Td> <Td> FORS </Td> <Td> Globoside alpha - 1, 3 - N - acetylgalactosaminyltransferase 1 (GBGT1) </Td> <Td> 9q34. 13 </Td> </Tr> <Tr> <Td> 032 </Td> <Td> Langereis </Td> <Td> LAN </Td> <Td> ABCB6, human ATP - binding cassette (ABC) transporter, mitochondrial porphyrin transporter . </Td> <Td> 2q36 </Td> </Tr> <Tr> <Td> 033 </Td> <Td> Junior </Td> <Td> JR </Td> <Td> ABCG2 . Multi-drug transporter protein . </Td> <Td> 4q22 </Td> </Tr> <Tr> <Td> 034 </Td> <Td> Vel </Td> <Td> Vel </Td> <Td> Human red cell antigens </Td> <Td> 1p36. 32 </Td> </Tr> <Tr> <Td> 035 </Td> <Td> CD59 </Td> <Td> CD59 </Td> <Td>--</Td> <Td> 11p13 </Td> </Tr> </Table>

Is there a blood group called a1b+