Support your confidence in this topic by refreshing your knowledge of substitution and changing the subject of formulae. A function takes an input value, applies a rule to it, and produces an output ...

Exosomes are saucer-shaped vesicles of 30–100 nm in diameter, which are delimited by a lipid bi-layer and which float at a density of 1.13–1.19 g ml −1 in sucrose gradients. These vesicles are ...