We find that a cis-pQTL (rs150158578) associated with decreased serum MSR1 (macrophage scavenger receptor types I and II) is causal for schizophrenia, supported by evidence from colocalisation analysis (CLPP4 = 0.75) and two-sample MR (BETA = −0.2205; SE = 0.0522; Wald ratio Padj = 1.44 × 10−2; Fig. 3). The gene discussed is MSR1; the disease is schizophrenia.