Fig 1: Immunoprecipitation with the serum samples of the patients suspected for macroprolactinemia. A, Relative levels of PRL‐specific IgG subclasses associated with PRL‐IgG complexes in patients with anti‐PRL autoantibodies are shown in bar graph. Data are expressed as mean ± standard deviation. B, Representative Western blots with the patients’ serum samples from Group 1 (#117, 159, 196, 229) and Group 2 (#120, 262, 302, 322). Lane 1: positive control loaded with pure IgG1‐IgG4 proteins