The invention generally features methods for providing engineered pluripotent stem cells that can be used to study biological response and pathways, including differentiation and drug effects. For example, these cells are provided comprising two or more exogenous expression cassettes including a selectable or screenable marker under the control of different condition-responsive regulatory elements, such as differentiation-responsive promoters or regulatory element of a receptor, drug target, drug metabolizing enzyme or signaling pathway gene. Also provided are sets of stem cell lines each comprising a different exogenous expression cassette including a selectable or screenable marker under the control of a different condition-responsive regulatory element.
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