Sequence analysis of cDNA, derived from NA(1+2+)SH(+) neutrophils. The nucleotide differences between the three transcripts are shown in the box below the figure. Panel 1 shows the normal NA1-FcγRIIIB–derived sequence as indicated by the presence of an A at nucleotide position 226. The sequence shown in panel 2 is derived from an NA2^60Ala-FcγRIIIBclone (226G and 266C). The third distinct transcript is derived from anNA2^SH-FcγRIIIB gene. The sequence is identical to the NA2^60Ala-FcγRIIIB sequence except for the A at nucleotide position 266, encoding an Asp at amino acid position 60.