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Spectrin (Sp), the most abundant of the erythrocyte membrane skeleton proteins, helps these cells maintain their characteristic biconcave shape while remaining flexible and elastic. Erythrocyte Sp is a heterodimer composed of a 280 kDa alpha subunit and a 246 kDa beta subunit which associate in a side-to-side, antiparallel configuration to form a 100 nm rod-like structure. Sp in other tissues may be composed of distinct but homologous alpha and beta subunits, sometimes referred to as fodrin. A newly introduced nomenclature designates the Sp subunits of the erythrocyte as alpha-1 and beta-1, and the fodrin subunits as alpha-2 and beta-2. Alternatively spliced forms of each are designated as epsilon-1, epsilon-2, etc. (e. g. beta-1 epsilon-1).
9930031C03Rik; A2a; a--fodrin; AI842465; AL033301; alpha II spectrin; alpha-fodrin; alpha-II spectrin; alpha-spectrin 2; beta fodrin; beta II spectrin-like (short form); beta-fodrin; beta-G spectrin; beta-I spectrin; Beta-II spectrin; beta-spectrin 1; beta-spectrin 2; beta-spectrin 2, non-erythrocytic; beta-spectrin II; beta-spectrin non-erythrocytic 1; betaSpII; brain alpha-spectrin; brain erythroid spectrin (235E); brain spectrin; bSPII-; cytoskeleton protein; D330027P03Rik; EL3; ELF; elf1; elf3; embryonic liver beta-fodrin; embryonic liver fodrin; embryonic liver fodrin beta chain; epididymis luminal protein 102; erythroid spectrin beta; fodrin alpha chain; Fodrin beta chain; Gm1301; HEL102; HS2; HSPTB1; inhibitory protein factor; IPF; ja; jaundiced; membrane cytoskeletal protein; mKIAA4049; mKIAA4219; noerythroid alpha-spectrin 2; non-erythrocytic; nonerythroid alpha-spectrin 2; non-erythroid spectrin beta; short form of beta II spectrin; Sp beta; spectrin alpha chain, brain; spectrin alpha chain, non-erythrocytic 1; spectrin beta 1; spectrin beta 2; spectrin beta chain, brain 1; spectrin beta chain, erythrocyte; spectrin beta chain, erythrocytic; Spectrin beta chain, non-erythrocytic 1; spectrin beta Tandil; spectrin beta, erythrocytic; spectrin beta, non-erythrocytic 1; spectrin G; spectrin R; spectrin, alpha, non-erythrocytic 1; spectrin, beta, erythrocytic; spectrin, beta, non-erythrocytic 1; spectrin, non-erythroid alpha chain; spectrin, non-erythroid beta chain 1; SPH2; Spna2; Spnb1; Spnb-1; Spnb2; Spnb-2; Spta2; Sptan1; SPTB; SPTB1; Sptb2; Sptbn1
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