Expand the following abbreviations :
BAC

Explanation

**Step-by-Step Solution:**

1. **Identify the abbreviation:** The abbreviation given in the question is BAC.

2. **Expand the abbreviation:** BAC stands for Bacterial Artificial Chromosome.

3. **Understand its function:** A Bacterial Artificial Chromosome is a vector used to clone DNA sequences in bacterial cells, particularly in E. coli.

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