SpermatogoniaSpermatogenesisTestisSpermatocytesSertoli CellsSpermatidsSpermatozoaSeminiferous EpitheliumSeminiferous TubulesHaemophilus influenzae type bCryptorchidismGerm CellsHaemophilus influenzaeSperm CountHaemophilus VaccinesProto-Oncogene Proteins c-kitHaemophilus InfectionsInfertility, MaleMeningitis, HaemophilusStem CellsLeydig CellsMeiosisCell DifferentiationImmunohistochemistry