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a, Alignments of the cytoplasmic tail of the FcoR4 alleles (A and B) and alternative splice variant (AS) of 4A. b, Cytoplasmic tails of FcoR3 alleles (A and B) and three alternative splice variants (AS). ITIM, hemITAM and tyrosine core motifs are highlighted in blue, red and green, respectively. AS-alternative splice variant.
