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1、阅读理解（二）SectionAScientistshavecuredcolorblindnessinmonkeysusinggenetherapy.Aswellasallowingcolor-blindhumanstotellredfromgreen,theinnovativetechniquecouldrestoresighttotheblind•Sufferersofage-relatedmaculardegeneration-themostcommoncauseofblindnessintheelde
2、rly-areamongthemillionswhocouldeventuallybenefit•ResearcherJayNeitzsaid:HIfwecouldfindawaytodothiswithcompletesafetyinhumaneyes,aswedidwithmonkeys,therewouldbealotofpeoplewhowouldwantit.Wehopethetechnologywillbeusefulincorrectingalotofdifferentvisiondisord
3、ers•11ProfessorNeitzusedgenetherapy—injectionsofgenes—toallowtwomalesquirrelmonkeyscalledSamandDaltontoseeinfullcolorforthefirsttime•Likesomehumanswithred-greencolourblindness,themonkeyslackedapigmentthatthecones-thecolour-detectorcellsatthebackoftheeye-ne
4、edtoseeredandgreen.Asaresult,theysawbothredandgreenasshadesofgrey.Othercolours,suchasorange,blueandbrownappearedwashed-out.Tocorrecttheirvision,theUSscientistsinjectedthemonkey1seyeswithmillionsofcopiesofageneneededtomakethemissingpigment9thejournalNaturer
5、eports•Importantly,themonkeyswereinjectedwithahumangene,suggestingthesametechniquewouldworkonpeople.Fourmonthslater,theirvisionsuddenlyimproved.ProfessorNeitz,oftheUniversityofWashingtoninSeattle,said:nItwasasiftheywokeupandsawthesenewcolours.Theyunquestio
6、nablyrespondedtocoloursthathadbeeninvisibletothem.nAversionofthecolourblindnesstestthatisusedinschoolsaroundtheworldshowedjusthowmuchtheirvisionhasimproved.DrKatherineMancuso,thestudy1sleadauthor,said:"Theirperformanceonredandgreenwassimilarzbutnotquiteasg
7、ood,asafemalemonkeywhohadnormalcolourvisionsincebirth.11Theneedtoprovethataddinggenestothebodydoesnotcauseharmfulside-effectsmeansitwillbesometimebeforethemethodisroutinelyusedtocorrectcolourblindnessinhumans.Despitethis,theresearchersareoptimisticandpoint
8、outthatgenetherapyisalreadybeingtestedonBritonsandAmericanswitharare,hereditaryformofblindnesscalledLeber1scongenitalamaurosis-Thetechniquecouldalsobeadaptedtotreatotherconditionsthatinvolveproblemswithgenesi
