{HEAD ~ Reservoirs} for fresh and waste media, including individual cocktails of growth factors, are located next to the Chamber and maintained at {TAIL ~ 4° C. Small volume syringe pumps} are used to deliver growth factors and base medium to user specified compositions, and waste media is aspirated from wells using the same pipette 
{ HEAD ~ Reservoirs } for fresh and waste media , including individual cocktails of growth factors , are located next to the Chamber and maintained at { TAIL ~ 4 ° C. Small volume syringe pumps } are used to deliver growth factors and base medium to user specified compositions , and waste media is aspirated from wells using the same pipette
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