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" ... Did all their study birds show this same change? Dr. Cooke and his colleagues examined both copies of MuPKS in all 162 of their wild type green study birds and compared them to both copies of MuPKS in their 118 derived blue study birds. They also sequenced 15 museum specimens from Australia. They found the blue birds all had the altered MuPKS (Figure 5A). Further, when they aligned the budgerigar MuPKS protein’s amino acid sequences with the synonymous protein’s amino acid sequences from other organisms, they found that one particular animo acid (dubbed “R644”) is identical in functional versions of this protein whether it is found in vertebrates, fungi or even in bacteria (Figure 5B). This animo acid is strategically located in the “active site” of the enzyme, which is critically important for manufacturing the yellow psittacofulvin pigment (Figure 5D). When this one amino acid residue is altered, the enzyme cannot work properly, and the yellow psittacofulvin pigment is not synthesized. ... "