Surfactant Metabolism Dysfunction, Pulmonary, 4, also known as pap due to csf2ra deficiency, is related to pulmonary alveolar proteinosis, acquired and surfactant metabolism dysfunction, pulmonary, 5. An important gene associated with Surfactant Metabolism Dysfunction, Pulmonary, 4 is CSF2RA (Colony Stimulating Factor 2 Receptor Subunit Alpha). Affiliated tissues include lung and respiratory system-lung, and related phenotypes are failure to thrive and decreased dlco