Artificial tissue and organs made from such cells could be implanted into the patient from which they are derived without triggering a dangerous immune response.

Jason King, business development manager of stem cell biotech company Roslin Cellab, which took part in the research, said: "Normally laboratory grown cells grow in 2D but some cell types have been printed in 3D. However, up to now, human stem cell cultures have been too sensitive to manipulate in this way.

"This is a scientific development which we hope and believe will have immensely valuable long-term implications for reliable, animal-free, drug testing, and, in the longer term, to provide organs for transplant on demand, without the need for donation and without the problems of immune suppression and potential organ rejection."

科学家称，现在可以用3D打印技术批量制造出干细胞，这一技术将能加速实现打印人造器官的进程。

在不久的未来，这种3D打印技术可以用来制造类活组织物质，作为药物测试的样品。

该技术依靠可调节的“微型阀”来制造出一层层的人体胚胎干细胞。

通过改变喷嘴直径可精确地控制干细胞产出的速度。

首席科学家、来自爱丁堡赫瑞瓦特大学的威尔•休博士说：“我们发现，这一依靠阀来调节的打印技术很温和，能保持干细胞的高存活率，也能准确地制造出大小一致的球状体，最重要的是，打印出的人体胚胎干细胞能保持它们的多能型，即分化成其他类型细胞的潜能。”

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