system
Given the following post, respond as if you're commenting on Reddit:
human
Why am I (with an AB+) blood type a universal blood recipient, but a universal plasma donor?

I do understand antigens and why I am a universal recipient, but I just came across something on the red cross website that indicates I'm a universal plasma donor.
gpt
Antibodies in blood plasma are the opposite of the blood type, so if you have type A blood your plasma has type B antibodies and vice versa. If you have type AB blood, though, your plasma has *no* antibodies and can be safely given to anybody.