28 kDa AKAP (AKAP28) is highly enriched in human airway axonemes. The mRNA for AKAP28 is up-regulated as primary airway cells differentiate and is specifically expressed in tissues containing cilia and/or flagella [1]. Homologs of AKAP28 are present in all animals and in some, including mice the AKAP28-like domain are preceded by another uncharacterized domain

1: Characterization of an A-kinase anchoring protein in human ciliary axonemes Kultgen,P.L., Byrd,S.K., Ostrowski,L.E. and Milgram,S.L. Mol Biol Cell. 2002 Dec;13(12):4156-66. PMID:12475942