Marking

Unknown

Reference information

Name	Unknown
Genotype	?/?
Mandatory picture?	Yes
Frequency (all time)	7.49 % (3,726 rats)
Frequency (in the last 2 years)	7.22 % (148 rats)
Average lifespan (all causes)	17.5 months (♀: 18.1 months – ♂: 16.9 months)

Description

Undetermined or invisible marking (dilution, naked).