The design file describing this study (Shockley et al., 2009) refers to the following: ROS - presence (R+) or absence (R-) of rosiglitazone PPAR - presence (P+) or absence (P-) of PPARg2 construct TIME- time after treatment (2, 24 or 72 hr) STATE - the activation state of the cells. a. ROS = presence of Rosi without PPARg2 construct b. NONE = no Rosi without PPARg2 construct c. ACT = Rosi with PPARg2 d. PPAR = no Rosi with PPARg2 CONDITION - the activation state at a particular time Sample - biological replicate (here, each array is a different biological replicate) Dye - always a one color array (Affymetrix Mouse 430 v2 arrays)