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.
The beet seed is actually a cluster of seeds in a dried fruit. Several seedlings may grow from each fruit. Some seed companies are now singulating the seed for precision planting, by dividing the fruit. Plant seeds about 1/2 inch deep and one inch apart. Allow 12 to 18 inches between rows.arvesting. Beets can be harvested whenever they grow to the desired size. About 60 days are required for beets to reach 1 1/2 inches in diameter, the size often used for cooking, pickling or canning as whole beets.