Vero cells are a cell line derived from the kidney cells of the African green monkey (\textit{Chlorocebus sabaeus}). They are commonly used in research, particularly in virology and for vaccine production, due to their ability to support the replication of a wide variety of viruses.
(1) Why Other Options Are Incorrect:
- Chinese hamster refers to the origin of the CHO (Chinese Hamster Ovary) cell line, which is used in genetic research, not the Vero cell line.
- Calf refers to various animal cell lines used for different research purposes but is not the source of Vero cells.
- Swine refers to pigs, whose cells are used for other types of research but not for the Vero cell line.
Conclusion:
Vero cell lines are derived from the kidneys of the African green monkey.