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Filename: drivers/Session_files_driver.php
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Function: require_once
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Backtrace:
File: /home/answnniz/public_html/index.php
Line: 315
Function: require_once
9. RAD genes were first isolated because mutants for these genes showed higher sensitivity to X-ray irradiation. Given the normal function of the products of these genes, why would these mutants be radiation-sensitive?