Biology — ABO Blood Groups

Antigens and antibodies of each blood group.

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digraph BloodGroups {
  node [shape=box, style=rounded];
  "Group A" -> "A antigen, anti-B antibody";
  "Group B" -> "B antigen, anti-A antibody";
  "Group AB" -> "Both antigens (universal recipient)";
  "Group O" -> "No antigens (universal donor)";
}