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Use "membranes" in a sentence
"For the information of the _unprofessional_ reader, I beg to observe, that the membranes of the brain are _serous membranes_."
"The transfer of viruses from hands to mucus membranes is what causes colds."
"Cell walls are known as membranes, and it's through the proteins found in them that cells communicate with each other, fending off diseases or succumbing to them."