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.
Beets should be planted from seed, directly into the garden. Each beet seed is actually a hard little cluster of 2 to 4 seeds. It takes several days or even a week for the outer seed coat to soften and allow the seeds inside to germinate. It's important to keep the soil consistently moist during this period.