The generic term biomaterial refers to any biological material used in an experiment. Biomaterial is subdivided in 4 components, biosource, sample, extract and labeled extract. The order used in presenting those entities is not innocuous as it represents the sequence of transformation a source material undergoes until it is in a state compatible with the realization of a microarray hybridization. This progression is actually mimicked in the BASEmenu again to insist on this natural progression.
BASE allows users to create any of the these entities fairly freely, however it is expected that users will follow the natural path of the laboratory workflow.
It is highly recommended that you have read Section 6.3, “Working with items” before continuing with this chapter.