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    Scientists say they have been able to successfully print new eye cells that could be used to treat sight loss.
    Many teams are researching different ways to repair the sight-giving cells of the retina
    The proof-of-principle work in the journal Biofabrication was carried out using animal cells.   The Cambridge University team says it paves the way for grow-your-own therapies for people with damage to the light-sensitive layer of tissue at back of the eye - the retina.   More tests are needed before human trials can begin.   At the moment the results are preliminary and show that an inkjet printer can be used to print two types of cells from the retina of adult rats-ganglion cells and glial cells.   These are the cells that transmit information from the eye to certain parts of the brain, and provide support and protection for neurons.   The printed cells remained healthy and retained their ability to survive and grow in culture.
    Retinal repair   Co-authors of the study Prof Keith Martin and Dr Barbara Lorber, from the John van Geest Centre for Brain Repair at the University of Cambridge, said: "The loss of nerve cells in the retina is a feature of many blinding eye diseases. The retina is an exquisitely1(精致地) organised structure where the precise arrangement of cells in relation to one another is critical for effective visual function.   "Our study has shown, for the first time, that cells derived2 from the mature central nervous system, the eye, can be printed using a piezoelectric inkjet printer. Although our results are preliminary and much more work is still required, the aim is to develop this technology for use in retinal repair in the future."    They now plan to attempt to print other types of retinal cells, including the light-sensitive photoreceptors(光感受器) - rods and cones3.    Scientists have already been able to reverse blindness in mice using stem cell transplants.    And there is promising4 work into electronic retina implants5 implants in patients.    Clara Eaglen, of the RNIB, said: "Clearly it's still at a very early stage and further research is needed to develop this technology for use in repairing the retina in humans.    "The key to this research, once the technology has moved on, will be how much useful vision is restored.    "Even a small bit of sight can make a real difference, for some people it could be the difference between leaving the house on their own or not.    "It could help boost people's confidence and in turn their independence."
    1 exquisitely      adv.精致地;强烈地;剧烈地;异常地 参考例句:
    He found her exquisitely beautiful. 他觉得她异常美丽。 来自《简明英汉词典》
    He wore an exquisitely tailored gray silk and accessories to match. 他穿的是做工非常考究的灰色绸缎衣服,还有各种配得很协调的装饰。 来自教父部分
    2 derived      vi.起源;由来;衍生;导出v.得到( derive的过去式和过去分词 );(从…中)得到获得;源于;(从…中)提取 参考例句:
    Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
    He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》
    3 cones      n.(人眼)圆锥细胞;圆锥体( cone的名词复数 );球果;圆锥形东西;(盛冰淇淋的)锥形蛋卷筒 参考例句:
    In the pines squirrels netmonly chew off and drop entire cones. 松树上的松鼠通常咬掉和弄落整个球果。 来自辞典例句
    Many children would rather eat ice cream from cones than from dishes. 许多小孩喜欢吃蛋卷冰淇淋胜过盘装冰淇淋。 来自辞典例句
    4 promising      adj.有希望的,有前途的 参考例句:
    The results of the experiments are very promising.实验的结果充满了希望。
    We're trying to bring along one or two promising young swimmers.我们正设法培养出一两名有前途的年轻游泳选手。
    5 implants      n.(植入身体中的)移植物( implant的名词复数 ) 参考例句:
    Hormone implants are used as growth boosters. 激素植入物被用作生长辅助剂。 来自《简明英汉词典》
    Perhaps the most far-reaching project is an initiative called Living Implants From Engineering (LIFE). 也许最具深远意义的项目,是刚刚启动的建造活体移植工程 (LIFE)。 来自英汉非文学 - 生命科学 - 医学的第四次革命

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