Table 1.

Organ weights and sperm characteristics of Tnp1-mutant males

Tnp1 genotype	Seminal vesicle weight, mg	Testis weight without tunica, mg	Sperm heads per testis, × 106	Sperm per two cauda epididymides, × 106	Epididymal sperm heads that were detached, %	Epididymal sperm heads with blunted tips, %	Motility, % (forward progression)
+/+	330  ± 27	104  ± 2	18.6  ± 0.4*	31  ± 2	3.9  ± 0.5	2.3  ± 0.5**	59  ± 4** (good)
+/−	326  ± 17	104  ± 3	19.8  ± 0.8	30  ± 2	3.5  ± 1.0	1.9  ± 0.4**	60  ± 4** (good)
−/−	323  ± 19	106  ± 2	21.1  ± 0.8	27  ± 1	3.6  ± 0.3	16.0  ± 2.6	23  ± 1  (poor)

Mice from the 129 background were used at 24 weeks of age. n = 10 for each genotype. Values were significantly different from Tnp1−/− mice (Student's t test). *, P < 0.05; **, P < 0.005.