Table 1.

Relative testes mass was calculated as described by Kenagy & Trombulak [49] followed by a calculation of the median for the species. Gene expression data are normalized, transformed median values. Species were ordered by relative testes mass (ascending).

species	relative testes mass	Prm1 (ΔCT)	Prm2 (ΔCT)	Tnp1 (ΔCT)	Tnp2 (ΔCT)	Tnp1/Tnp2	Prm1/Prm2	Prm/Tnp	Prm2/Tnp	Prm2/Prm	Prm2/(Prm + Tnp)
Mus castaneus	0.27	3.16	4.29	2.96	3.38	0.83	0.67	1.24	0.75	0.60	0.33
Mus pahari	0.27	3.80	3.69	3.01	2.26	1.13	1.01	1.38	0.68	0.50	0.29
Mus domesticus	0.32	2.11	3.22	1.88	2.32	0.81	0.65	1.27	0.77	0.61	0.34
Mus musculus	0.44	2.87	3.72	3.27	2.98	1.14	0.76	1.06	0.61	0.57	0.29
Mus caroli	0.46	5.83	7.28	6.71	6.18	1.07	0.78	1.00	0.56	0.56	0.28
Mus spretus	0.87	1.90	2.31	2.32	1.70	1.38	0.82	1.05	0.58	0.55	0.28
Mus macedonicus	0.95	3.54	3.49	2.48	2.14	1.05	0.99	1.49	0.74	0.50	0.30
Mus spicilegus	1.51	4.61	4.60	4.76	3.92	1.16	0.98	1.05	0.53	0.50	0.26
CV	0.69	0.37	0.36	0.46	0.46	0.18	0.17	0.15	0.14	0.08	0.09