Choose 1 to extract macrophages from 4-week-old rats, because the organs are mature and the rats grow rapidly. The 1 day in rats is equivalent to 40 days in humans. At 4 weeks, the body organs gradually mature and are suitable for removal.
2. The life and health index is good, and the 4-week-old rats are in the prime of life, and all aspects of their bodies are in a very healthy state, which is conducive to extracting cells.