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.
How to Harvest and Store Brussels Sprouts. How to Harvest Brussels Sprouts Harvest Brussels sprouts when they are Â½ to 1Â¾ inches (1-4 cm) in diameter, green, and firm. Brussels sprouts are ready for harvest 90 to 110 days after sowing.