For 10 points, name these male gametes that fertilize eggs.
These cells have outer dense fiber proteins used in structural elements. Histone variants used by these cells include hils1. Sertoli cells play an important role in the development of these cells which are created in the seminiferous tubules. The acrosomes of these cells break down an associated cell's zona pellucida. Their movement is enabled by flagella. These haploid cells develop and are stored in the testes. For 10 points, name these male gametes that fertilize eggs.
These cells have outer dense fiber proteins used in structural elements.
{sperm} cells [or {spermatozoa}; or {spermatozoan}]