Table 2.

Ultrastructural Features of Leydig Cells during annual reproductive cycle of Chinese soft-shelled turtle

Features	Reproductive phase	Hibernation phase
Cluster Area / mm2	0.72 ± 0.1	1.5 ± 0.2
Nucleus	Round with smooth nuclear membrane (diameter = 7.1 ± 0.24 μm)	Oval to elliptical with irregular nuclear membrane (diameter = 6.9 ± 0.35 μm)
Lipid droplets	Few (diameter = 0.84 ± 0.027 μm)	Numerous (diameter = 1.1 ± 0.08 μm)
Mitochondria	Tubulo-vesicular cristae
SER	Tubule-vesicular	Mainly tubular
Surface	Less Interdigitation space (finger like protrusions)	More Interdigitation space (finger like protrusions)
Arranged	Cluster	Cluster