The container, or housing, also has {TAIL ~ a membrane} at an opening thereof which is permeable to {HEAD ~ oxygen} 
The container , or housing , also has { TAIL ~ a membrane } at an opening thereof which is permeable to { HEAD ~ oxygen }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD