ultracentrifugation analyses. 10 During treatment mean values for cholesterol, triglycerides, beta and pre-beta lipoproteins, and total lipids fell significantly, whereas the alpha-lipoprotein concentration remained virtually unchanged in type IIA and HB patients. Individual alpha and beta lipoprotein values for the ttn patients are given in the accompanying figure. Alpha values fell in 8 patients, rose in 13, and were unchanged in 4. In the same group beta lipoproteins fell, with only one increase, perhaps an erroneous measurement, from 5.5to 5.8 g/1. Similar results were also obtained with type-its patients. In type iv the mean alpha value rose from 1.11 to 1.50 g/1 (p