Table 1.

Characteristics and number (N) of mice serving as odor donors

Group	Donor type†	Odor source	Gender	N (per panel)*				Age range, weeks‡
				Training		Generalization
				+	−	+	−	+	−
1	Infectious MMTV	Mice	Female	16	19	12	12	12–32	12–32
2	Infectious MMTV	Urine	Female	34	38	14	14	12–36	12–36
3	Infectious MMTV	Mice	Male	20	12	12	12	12–32	12–32
4	Infectious MMTV	Urine	Male	34	38	32	24	12–32	12–32
5	Rederived infectious MMTV	Mice	Female	24	24	12	12	12–40	12–40
6	Rederived infectious MMTV	Urine	Female	44	42	12	13	20–44	20–44
				+/−	−/−	+/−	−/−	+/−	−/−
7	Genetically transmitted MMTV	Urine	Male	13	4	10	11	16–24	20–24

^*Number of individual mice making up each donor panel. For any given trial, one mouse or urines of one to three mice selected randomly from the donor panel served as the stimulus. +, mice positive for infectious MMTV; −, mice without infectious MMTV; +/−, mice heterozygous for MMTV provirus; −/−, mice with no MMTV provirus alleles. 

^† Infectious MMTV, MMTV transmitted from mother to offspring via virus particles in mouse milk. Rederived infectious MMTV, offspring of previously noninfected female mice fostered onto infected nursing mothers. Genetically transmitted MMTV, mice carrying an endogenous MMTV provirus. 

^‡ Post hoc examination of the data showed no indication of any differences in response as a function of age of donors.