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Foreseeing a time when a patient's own cells may be harvested,multiplied,and fashioned into a replacementorgan,researchers in Boston have successfully transplanted laboratory grown bladders (into six dogs.For a century,physicians have replaced diseased or damaged bladders by removing sections of a person'sintestines (and shaping them into a substitute bladder.While the procedure offers some relief to patients,complications often develop because nature designs intestinal tissue for a purpose-absorbing nutrients-other thanholding waste liquid of the body."You start absorbing stuff that should be removed,"says Anthony Atala of theChildren's Hospital in BostonOther physicians have turned to human-made materials to create artificial bladders,but those efforts havealso run into problems.Consequently,to build a better bladder,Atala and his colleagues decided to employ theorgan's own cellsTo turn the cells into an organ,the researchers first form plastic which can break down naturally intobladder-shaped shell.They then coat its outside and inside with layers of cells neededTo test this strategy,Atala's group obtained bladder tissue from dogs and grew it into organs.After removingthe dogs'bladders,the investigators implanted (the artificial ones coming from the dogs'own cells.Withina month,the organs began to perform like normal bladdersWithin three months,the plastic shells had broken down naturally,and the implanted organs were hard todistinguish from natural ones.Blood vessels (I)quickly grew into them.Moreover,nerves seem to formproper connections with the new organs,allowing the dogs to regain normal control of their bladders.Some dogshave had the artificial bladders for nearly a year without any problems.While the bladders of dogs closely resemble those of people,Atala warns that more testing of this transplantstrategy must occur before artificial bladders are ready for the clinic.28.The traditional method of shaping parts of intestines into a substitute bladderA.allows the patient to absorb useless thingsB.brings the patient a lot of sufferingsC.prevents the patient from absorbing nutrientsD.worsens both the function of the intestines and the bladder29.The artificial bladders implanted in dogsA.worked perfectly as long as three monthsB.began to work as well as a normal one in a few weeksC.proved to be able to work for several yearsD.did not work properly until after a month30.Why is it suggested that more testing should be made?A.What suits dogs'bladders will also suit human bladders.B.Dogs'bladders can be implanted into human bodies.