There are many different cell types and sub-types involved in the immune system. Some of the main types include: Lymphocytes: are white cells which circulate between blood and lymph. They play an important role in fighting infection.
After about 50 to 60 days, beets are ready to harvest. Not only can the roots be dug up and chopped to add flavor to a meal, but the greens of the beets can be harvested periodically and put in salads. Given how well these beets fare in different weather conditions, they can be grown several times in a summer.
In containers, you can plant the beet seeds in all directions for a full crop. Just be sure to leave at least an inch between the rim of the container and the first planting of beets. Cover and water the seeds well. Keep the soil moist and the beets should germinate within a couple weeks time.