These polypeptides have an amino acid sequence which has at least 70% identity to either of three phytases derived from the bacterium Buttiauxella, and which comprises at least one of the following amino acids at the position indicated: 119N, 120L, and 121E. {HEAD ~ These phytases} have {TAIL ~ an improved specific activity} 
These polypeptides have an amino acid sequence which has at least 70 % identity to either of three phytases derived from the bacterium Buttiauxella , and which comprises at least one of the following amino acids at the position indicated : 119N , 120L , and 121E. { HEAD ~ These phytases } have { TAIL ~ an improved specific activity }
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