Immunodeficiency 73b with Defective Neutrophil Chemotaxis and Lymphopenia, is also known as imd73b. An important gene associated with Immunodeficiency 73b with Defective Neutrophil Chemotaxis and Lymphopenia is RAC2 (Rac Family Small GTPase 2). Affiliated tissues include neutrophil and nk cells, and related phenotypes are recurrent respiratory infections and recurrent otitis media