Let W be a finite or an affine Coxeter group and Wc the set of all the fully commutative elements in W . For any left cell L of W containing some fully commutative element, our main result of the paper is to prove that there exists a unique element (say wL) in L ∩ Wc such that any z ∈ L has the form z = xwL with `(z) = `(x) + `(wL) for some x ∈ W . This implies that L is left connected, verifyi...

Immunofluorescent studies were performed upon the small intestinal mucosa obtained by jejunal biopsy of seven patients suffering from the coeliac syndrome and six control subjects. Seven patients had normal villous morphology and six had subtotal villous strophy. In the group whose jejunal biopsies were normal using routine histological examination, the predominant type of immunoglobulin-contai...