MUC5AC and chronic obstructive pulmonary disease: In contrast to the associations we detected between COPD phenotypes and the lead MUC5B pQTL variant, we did not detect any associations with the other MUC5B pQTL (rs10001928), nor the two MUC5AC pQTL (rs75401036 and rs16866419), in SPIROMICS, COPDGene, or the UK Biobank, as shown in S15–S17 Tables.