text: Intact mass analysis of a mixed population of proteins. A mixture of the membrane protein KCNJ12, the soluble TEV protease used to cleave the fusion tag, and the membrane protein HVCN1, which occurred as a contaminant from an earlier analysis on the same LC column.
  
entities.text: ['membrane']
entities.type: Cellular_component
entities.entity_id: PMC-3041925-caption-05_T1
entities.text: ['membrane']
entities.type: Cellular_component
entities.entity_id: PMC-3041925-caption-05_T2