You will find four blood types: A, B, AB, or O. Also, blood is possibly Rh-good or Rh-unfavorable. So When you have type A blood, it's possibly A constructive or simply a detrimental. Which sort you're is important if you want a blood transfusion. And also your Rh issue https://top100bookmark.com/story20095114/about-blood-castle-mu-online