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Arabidopsis Type III PtdIns 4-kinases. A, Linear representation of the introns and exons (solid bars) of the genomic sequence of AtPI4Kα1. The open reading frame of AtPI4Kα1 is 6,066 nucleotides long. B, Amino acid sequence homology among Arabidopsis PtdIns 4-kinases. AtPI4Kα1, AtPI4Kα2, and AtPI4Kβ1 homologies in the lipid kinase unique domain, PH domain, and the catalytic domain are indicated.
