two nonadecamers were synthesized to serve as probes : one , entirely homologous to the normal 3 ' end of alpha 2a-globin gene sequence , including the termination codon taa , the other different from it by a replacement of the t in the termination codon taa with c , changing it to caa , the codon for the amino acid glutamine .
C0002520
amino acid
C0017797
glutamine