Mean perivascular cell cluster number and cumulative cluster size identified in male and female mice of the various mouse strains at the age of 20 months.

*Cluster #: number of perivascular cell clusters present per renal cross-section.**“0”: relative cluster size 0.15.§strains included in the kinetics analyses: 6, 12 and 20 months.†strains without TLOs included in lymphatics and liver infiltration analyses.‡strains with TLOs included in lymphatics and liver infiltration analyses.n: number of kidneys/mice analyzed; nd: not determined.