With reference to 'stem cells', frequently in the news, which of the following statements is/are correct?<br/>1. Stem cells can be derived from mammals only.<br/>2. Stem cells can be used for screening new drugs.<br/>3. Stem cells can be used for medical therapies.<br/><br/>Select the correct answer using the codes given below:

1. Stem cells can be derived from mammals only. — Incorrect
Stem cells are not exclusive to mammals; they are also found in other organisms, including plants and some non-mammalian animals.

2. Stem cells can be used for screening new drugs. — Correct
Stem cell-based models are widely used to test drug safety, efficacy, and toxicity in research.

3. Stem cells can be used for medical therapies. — Correct
Stem cells are used in regenerative medicine and therapies such as bone marrow transplantation.

Therefore, statements 2 and 3 only are correct.