544,147 BJORKLUND MARIANA A study on the regulation of immunoglobulin isotope commitment :/thesis/ /Mariana Bjorklund ; Department of immunology University of Umea. — Umea : Univ., 1985. — 48 s., 5 prac/152/ s. : il., wykr. ; 22 cm + /dod./ : 2 s. (Umea University Medical Dissertations ISSN 0346-6612. New Series ; No 150)