title: Properdin deficiency.
mesh_terms: D003167:Complement Activation; D003170:Complement Pathway, Alternative; D005808:Genes, Recessive; D008040:Genetic Linkage; D006801:Humans; D008589:Meningococcal Infections / Q000276:immunology*; D011414:Properdin / Q000172:deficiency* / Q000235:genetics; D014960:X Chromosome
chemical_list: D011414:Properdin