Wheeler D A, Nelson J M, Shulman I A, Okamoto M, Dave V, Yoshida A
Blood. 1984 Mar;63(3):711-3.
The designation B4 is proposed for a weak variant of type B blood found in a Salvadorian woman and her two daughters. The red cells were weakly agglutinated by anti-B and anti-A,B; the serum contained anti-B; and the saliva contained H but not B substance. Biochemical studies of the serum showed that the enzyme specified by the variant B gene had low activity and low affinity for both sugar donor and acceptor.
在一名萨尔瓦多妇女及其两个女儿身上发现了一种B型血的弱变体，提议将其命名为B4。其红细胞与抗B及抗A、B的反应较弱；血清中含有抗B；唾液中含有H物质但不含B物质。血清的生化研究表明，由变体B基因指定的酶对糖供体和受体的活性及亲和力均较低。
