the concentration of gpc was highest in the caput and corpus regions of the epididymis , that of phosphocholine changed little along the length of the rat epididymis and there was approximately a 3-fold increase of concentration of inorganic phosphate in the luminal fluid from caput epididymidis to ductus deferens .
C0014533
epididymis
C0228023
caput epididymidis