Why Are the Antibodies to the COST Collection Antigens Difficult

question 61

Multiple Choice

Why are the antibodies to the COST collection antigens difficult to identify?

• A) The COST antigens are located on carried on the same CR1 receptor as Knop antigens.
• B) The COST antigens are only expressed on cord blood cells.
• C) The COST antigens are expressed with a high degree of variability.
• D) The COST antigens are present in a very low frequency in most populations.

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