expression of these common fragile sites at 4q23 and 7q11.23 could not be induced in blood lymphocytes from two subjects using methotrexate and thymidine , or by any other means including the addition of bromodeoxyuridine and fluoro-deoxyuridine or growth in folate-deficient medium .
C0006233
bromodeoxyuridine
C0011535
deoxyuridine