AbstractWe have measured the H type 1, Leaand Lebantigens in the saliva from 129 Japanese individuals by a time‐resolved europium ion fluorometric immunoassay using artificial antigen‐albumin complexes as the reference substances. We confirmed that the amount of Lebwas larger than that of Leain the saliva from secretors (Lea–b+) and vice versa in the saliva from nonsecretors (Lea+b–). Unexpectedly, we discovered appreciable amounts of Lebwith small amounts of H type 1 in the saliva from the nonsecretors. The concentration of Lebwas about 10, 6 and 35 of the concentration of the Leain the saliva from the nonsecretors of the A, B and O groups, respectively. The possible formation of Lebfrom Lea, in addition to the formation of Lebfrom H type 1, in the salivary glands is di
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