Landsteiner's Discovery Means We Are A, Ab, B or O

This page is the CodyCross answer for the clue below from Art Museum, Group 725, Puzzle 4 (Advisory Board).

Question is: Landsteiner's Discovery Means We Are A, Ab, B or O

and the answer is: BLOODTYPE

Word Meaning:

BLOOD TYPE — Any classification of human blood by the presence or absence of various antigens in a person’s red blood cells.

Definitions from Wiktionary.