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Structure of Drosophila Catsup protein and locations of the Catsup47 and Catsup48 mutations. Catsup protein showing the predicted signal peptide (SP), histidine-rich regions (His), conserved HELP domain (Suzuki and Endo, 2002) and six transmembrane domains (TM1-6). Locations of amino acid alterations in the newly isolated mutants Catsup47 and Catsup48 are indicated.
