The immune system recognizes and destroys substances that contain antigens. Your body's cells have proteins that are antigens. These include a group of antigens called HLA antigens. Your immune system learns to see these antigens as normal and usually does not react against them.
Mother's Day 2016. Need to know the exact date of Mothers Day this year? Here's a chart that shows what day Mother's Day is celebrated from 2014 - 2021. In the US, Mother's Day is celebrated on the second Sunday in May. In the UK, mothers are honored the fourth Sunday of Lent. Check out our fun Mother's Day Games and Activities for teachers!
Mother's Day, or Mothering Sunday, is now a day to honor mothers and other mother figures, such as grandmothers, stepmothers and mothers-in-law. Many people make a special effort to visit their mother. They take cards and gifts to her and may treat her to brunch, lunch or high tea in a cafe, restaurant or hotel.