Most researchers trying their hands at protein arrays have resorted to spotters, widely used in the DNA array field, as their tool of choice for placing proteins at their assigned locations. The technology is reliable and fairly reproducible, but it suffers a few drawbacks: it requires access to a spotter, the arrays are not identical, and high-volume spotting can take a long time. To address this problem, at least three groups of researchers have developed an alternative that might be called sushi arrays.