The aim of the JHMI Microarray Core Facility is to provide cost-effective and time-efficient access to microarray technology, as well as an environment that facilitates effective analysis and sharing of microarray data. Data and information supplied by the Core are intended for research use only. This facility is not certified to supply data to be used in clinical care. The JHMI Microarray Core Facility consists of two functionally separate units. The Hybridization Unit currently provides labeled target production, hybridization, and data collection services for Affymetrix arrays. The Analysis Unit offers support for array analyses, provides access to commercially available software through shared seat licensing, and maintains a shared-access microarray database.