serum
Enzyme-linked immunosorbent assay was        used to measure the levels of IL-6 and sIL-6R in organ cultures of mucosal       tissues and in cell cultures of fractionated mucosal cells as well as in the       serum.
Enzyme-linked immunosorbent assay was        used to measure the levels of  @OBJECT$  and sIL-6R in organ cultures of mucosal       tissues and in cell cultures of fractionated mucosal cells as well as  @PREDICAT$  the        @SUBJECT$ .