<prompt> Chediak higashi syndrome, defect is-Fusion of lysosomeT-cellsB-cellsComplement  <response>: Chediak higashi syndrome -Defective phagolysosomal fusion leading to decrease in melanocytes Severe Combined Immunodeficiency- Deficiency of Purine Nucleoside Phosphorylase Chronic Mucocutaneous Candidiasis- T cell disorder leading to recurrent candidiasis X linked Hyper IgM Syndrome- Deficiency of CD40 Ligand on activated T cell 