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