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!
100 Thoughtful Motherâs Day Quotes. Motherâs Day is the special time of year when you get to celebrate your first best friend and the person you always turn to when you need advice. Motherâs Day is also a great time to show your love for all the other wonderful women in your life.