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 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?

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Correct answer: 3 and 4. Stem cells are undifferentiated cells with the potential to develop into various specialized cell types, offering promise for regenerative medicine and disease treatment Statement 1 and 2 are incorrect: The blastocyst stage of embryos is a common source of embryonic stem cells, but it is not the only source. Stem cells can also be derived from adult tissues (adult stem cells) and umbilical cord blood. As of current techniques, obtaining embryonic stem cells typically requires the destruction of the blastocyst. Alternative methods are being actively researched to derive stem cells without causing harm to the blastocyst. Statement 3 is correct: Stem cells, such as embryonic stem cells have the ability to self-renew and regenerate themselves in vitro indefinitely under appropriate conditions. This property makes them valuable for research and therapeutic applications. Statement 4 is correct: Indian research centers, such as the National Centre for Biological Sciences (NCBS) and the Indian Council of Medical Research (ICMR), have successfully created a few stem c

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