38.accumulation

　　39.Previous

　　40.premature

　　41.overdrive

　　42.regulated

　　43.normal

　　44.actually lived longer even when stripping out the impact of having less cancer

　　45.makes sure that damaged cells destroy themselves and do not divide uncontrollably to cause

　　46.the mice can benefit from the extra copy of the genes without having to be starved

　　Section C

　　One of the genes that protects us from cancer may also help delay aging, according to a new study.

　　The findings could also one day lead to new drugs that prevent or fight cancer while extending healthy youth and life span, said Manuel Serrano, a researcher at the Spanish National Cancer Research Centre, who worked on the study.

　　Serrano said researchers genetically engineered mice to have an extra copy of a key cancer-fighting gene called p53 and found it also played an important role in delaying aging.

　　Everyone agrees that the aging is produced by the accumulation of faulty cells, Serrano said. In other words, p53 delays aging for exactly the same reason that it prevents cancer.

　　Previous cancer studies have shown that p53 can actually cause pre-mature aging symptoms by killing too many cells when it goes into overdrive, but Serrano said his research strictly regulated the gene so that it turned on only when needed.

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