1.What is a microarray Which is the probe?and which is the target? There are some differences between China and United States of America. In U.S.A.the probe are usually in solution. In China the probe is a reagent to detect target from sample.1.What is a microarray Which is the probe?and which is the target? There are some differences between China and United States of America. In U.S.A. the probe are usually in solution. In China the probe is a reagent to detect target from sample