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A comparison of the amino acid sequence of the T . thermophilus enzyme with that of the Escherichia coli enzyme showed ( i ) a 37 % overall similarity ; ( ii ) the conservation of the Ser residue , which is known to be phosphorylated in the E . coli enzyme , and of the surrounding sequence ; and ( iii ) the presence of 141 extra residues at the C terminus of the T . thermophilus enzyme .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None