Ventricle size and lymphatic CSF uptake. (A) Mean ventricular volumes in the kaolin injected rats were significantly greater (*) than those in the saline injected animals (p < 0.0001; independent t-test). (B) The enrichment of radioactive protein tracer in the olfactory turbinates (lymphatic CSF uptake) was significantly less (*) in the animals receiving kaolin (p < 0.0001; independent t-test). The numbers of animals in each group are indicated below each histogram. The numbers within the brackets represent data taken from .