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. 1999 Jan 4;189(1):37–50. doi: 10.1084/jem.189.1.37

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Microvillous expression of L-selectin confers enhanced tethering in all venules, but is most critical in venules with diameters above 20 μm. Rolling fractions were determined as described in Materials and Methods. The ratio of rolling fractions of wild-type L-selectin (microvillous) versus L/CD44 (cell body) transfectants was determined for venules with different diameters. Each point represents one venule. A ratio of one (hatched horizontal line) indicates equal rolling fractions, a ratio of two means that wild-type transfectants rolled twice as frequently in a venule than L/CD44 cells, and so on. A linear regression line was generated with the help of PC-based graphics software (Sigma Plot). Note that rolling ratios in many venules with diameters below 20 μm (indicated by vertical broken line) tend to be lower than in larger vessels.