| 1 | The team found differences in activity and anxiety levels. | |
| 2 | Active cell can maintain the proper concentration of sodium in the body. | |
| 3 | Such differences in activity and anatomy, though, must have deeper causes. | |
| 4 | It is only a question of very, very low activities so it is nothing for people to worry about. | |
| 5 | Heijtz, Pettersson, and colleagues then analyzed the chemistry and gene activity in the brains of these mice. |