Thank you Phil. I have it and I thought about adding it to the article too but it'd make the article too gigantic sized so I didn't include it in this one. This one was meant to be a basic overview of blood. I'll publish another article about blood grouping and compatibility chart in a few days. Follow me at Hive account@nuforhad and the Utopian community https://hive.blog/hive-110714 to get latest updates whenever we have something new.