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This is an issue edsumm for 1422. Identification of the Palaeocene/Eocene thermal maximum in a marine sedimentary sequence shows that sea surface temperatures near the North Pole increased from roughly 18 degrees Celsius to over 23 degrees Celsius — such warm values imply the absence of ice and thus exclude the influence of ice-albedo feedbacks on this Arctic warming.
Lipoprotein lipase, the enzyme that hydrolyzes fatty acids from triglycerides carried by circulating lipoproteins, resides on the surface of the capillary endothelium. Analysis of a hypertriglyceridemic mutant mouse has now identified a protein, LMF1, that is critical for the transport of active lipoprotein lipase through the secretory pathway.