FAM128A and FAM128B proteins have been re-named MOZART2A and B. The name MOZART is derived from letters of 'mitotic-spindle organizing proteins associated with a ring of gamma-tubulin'. This family operates as part of the gamma-tubulin ring complex, gamma-TuRC, one of the complexes necessary for chromosome segregation. This complex is located at centrosomes and mediates the formation of bipolar spindles in mitosis; it consists of six subunits. However, unlike the other four known subunits, the MOZART proteins, both 1 and 2, do not carry the conserved 'Spc97-Spc98' GCP domain, so the TUBCGP nomenclature cannot be used for it. The exact function of MOZART2 is not clear [1].

1: Systematic Analysis of Human Protein Complexes Identifies Chromosome Segregation Proteins. Hutchins JR, Toyoda Y, Hegemann B, Poser I, Heriche JK, Sykora MM, Augsburg M, Hudecz O, Buschhorn BA, Bulkescher J, Conrad C, Comartin D, Schleiffer A, Sarov M, Pozniakovsky A, Slabicki MM, Schloissnig S, Steinmacher I, Leuschner M, Ssykor A, Lawo S, Pelletier L, Stark H, Nasmyth K, Ellenberg J, Durbin R, Buchholz F, Mechtler K, Hyman AA, Peters JM; Science. 2010; [Epub ahead of print] PMID:20360068