Assertion: codon | /r/CapableOf | start with guanidine
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Source sentences:
text: The codon usage of the bacteriophage ΦX174 (5,386 bp), the first genome to be sequenced entirely, was found to be non-random, with a bias towards codons whose third position was thymidine (T) and away from codons starting with adenosine (A) or guanidine (G).