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Examination of several commercially available thermostable DNA polymer
ases identifies 9 degrees N DNA polymerase as single enzyme that could
incorporate two components of an expanded genetic alphabet, 2,4-diami
nopyrimidine and xanthosine as deoxynucleoside triphosphate opposite t
heir cognate base in a DNA template. (C) 1998 Elsevier Science Ltd. Al
l rights reserved.