This will keep an egg preserved as long as you have a supply of spoilage to feed it (consumes around 17.25/min or 1035 spoilage per hour). If you want to turn off your gleba factory or stop producing science without losing all your eggs you can use this design to preserve an egg for you (if you have a stockpile of spoilage to keep it going).
All excess eggs created are burned in a heating tower but it could be easily modified so they are sent to your factory to kickstart it when desired.
Only put 1 fresh egg in the biochamber to start it off!