Number of ESTs in each cluster class. A cluster class included all the clusters that contain the same number of ESTs. Most ESTs remained singletons (class 1). The largest cluster contains 14 ESTs (class 14). INSET: Redundancy of and overlap between the two libraries. ''Adult clusters'' contained only adult ESTs, ''juvenile clusters'' contained only juvenile ESTs and ''mixed clusters'' contained at least one adult and one juvenile EST. The majority of the ESTs remained singletons.