This is Lung Surfactant
New trendy design for this season's hottes... ...nt dye to reveal the patterns made by lung surfactant , a soaplike material that covers the... ...aterial that covers the inside of the lungs . Without surfactant , the *strong class="match...
https://www.neatorama.com/2013/04/15/This-is-Lung-Surfactant/
