With reference to developments in stem cell research consider the following statements 1 n...........

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With reference to developments in stem cell research, consider the following statements:

1 The only source of human stem cells is 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?

1, 2, 3 and 4

1, 2 and 3

1, 2 and 4

3 and 4

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Explanation:

1st and 2nd statements are incorrect.
Stem cells are a class of undifferentiated cells that are able to differentiate into specialized cell types. Commonly, stem cells come from two main sources:
1) Embryos formed during the blastocyst phase of embryological development (embryonic stem cells) and
2) Adult tissue (adult stem cells).
Both types are generally characterized by their potency, or potential to differentiate into different cell types (such as skin, muscle, bone, etc.).