Table 4.

Characteristics of archiving units

	Features common to most facilities	Facilities with unique features
Hygiene	Behind barrier	JAX	Behind and outside barrier
		HMGU	Behind and outside barrier; quarantine
		MLC, IRC	Behind barrier and quarantine
		TCP	Outside barrier
Rooms	Shared with transgenic unit and rederivation	MLC, RSF, ICS, IRC, HZI	—
Located in quarantine	MLC, HMGU, IRC	—
Archives	Frozen embryo banking; sperm banking (in place or at least planned)	ICS, HMGU, TCP	Also serum and blood banking
		HMGU, MLC, RSF, TCP, JAX	Also tissue banking
		TCP, JAX	Also ovary banking
		HMGU, JAX	Also living mice
		HMGU, MLC, TCP	Also N-ethyl-N-nitrosourea DNA and sperm
		HZI, BRC	No sperm banking
	BRC	No archives yet established
Services	Embryo and sperm cryopreservation and recovery	ICS, RSF, HZI	Only embryo cryopreservation and recovery
		TCP, JAX	Also ovary transplantation; ovary cryopreservation and recovery
	HZI	No external services
Strain services	Rederivation by IVF speed expansion; strain rescue	ICS, HZI	Only speed expansion
		RSF, BRC, HZI	Only rederivation by IVF
		TCP	Also speed cryopreservation (sperm and wildtype ovary)
		JAX	Rederivation from induced pluripotent stem cells (in development)
	HZI	No services