Excessive anonymity.
D000918:Antibody Specificity; D044383:Black People; D001771:Blood Banks; D001782:Blood Donors; D006076:Government; D006801:Humans; D007125:Immunogenetics; D011287:Prejudice; D011822:Race Relations; D044469:Racial Groups; D012926:Social Control, Formal; D014481:United States; D001741:Black or African American