With reference to the latest developments in stem cell research, consider the following statements: 1. The only source of human stem cells are the embryos at blastocyst stage 2. The stem cells can be derived a without causing destruction to blastocysts 3. The stem cells can regenerate themselves in vitro virtually forever 4. Indian research centres also created a few cell lines which can be developed into many types of tissues Which of these statements are correct?
Options
(a)1, 2, 3 and 4
(b)1, 2 and 3
(c)1, 2 and 4
(d)3 and 4
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