Semen by definition is the fluid ejaculated from a male, which includes the sperm cells as well as a number of other components. The Elements (ingredients) Of Semen. Very simply put, seminal fluid is a thick white secretion rich in sugars, mostly fructose to fuel the sperm cells on their journey to the egg. This secretion is what composes the bulk of semen by volume (50-80%). Although mostly comprised of water, proteins, and sugars.
The T-cell receptor, or TCR, is a molecule found on the surface of T cells, or T lymphocytes, that is responsible for recognizing fragments of antigen as peptides bound to major histocompatibility complex (MHC) molecules.
Small lymphocytes 7â8 Large lymphocytes 12â15. 1  B cells: releases antibodies and assists activation of T cells. 2  T cells: CD4+ Th (T helper) cells: activate and regulate T and B cells. CD8+ cytotoxic T cells: virus-infected and tumor cells. 3  Natural killer cells: virus-infected and tumor cells.