- Beginning at puberty, many Leydig cells display rod-shaped or wedge-shaped rectangular or diamond-shaped protein crystals in different numbers and sizes.  These protein crystals are named Reinke crystals; named after anatomist, Friedrich B. Reinke (1862-1919).

Reference:
1. Color Atlas of Cytology, Histology, and Microscopic Anatomy 4th Edition. Wolfgang Kuehnel, M.D. Thieme Publications. 2003.