The gangliosides from the lymph nodes and blood sera of normal and T-lymphomic baboons were studied. In lymph nodes the major gangliosides were identified as GM3 and GD3, those in blood sera--as GM3, GM1 and GD3. Gangliosides GM3 and GD3 contained N-acetyl as well as N-glycoloyl neuraminic acids. In gangliosides isolated from lymph nodes and blood sera of T-lymphomic baboons the levels of N-glycoloyl neuraminic acid markedly exceeded that in normal tissues. In tumour lymph nodes the GM3/GD3 ratio was shifted towards GD3.
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