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Though many difficulties still remain, gene therapies have been developed for a number of diseases and many more are being tested on patients in clinical trials. |
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Gene therapies for several diseases are being developed or tested on patients in clinical trials, but many obstacles must still be overcome. |
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Once these difficulties have been overcome, gone therapies for a number of diseases can be developed and even tested on patients in clinical trials. |
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Gene therapies for a variety of diseases have been developed and are being tested on patients in clinical trials to find out what obstacles, if any, remain. |
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Although many obstacles must still be overcome, gene therapies for a number of diseases are undergoing development or are being tested on patients in clinical trials. |