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Stem cells are defined by self-renewal (indefinite proliferation while maintaining an undifferentiated state) and potency (capacity to differentiate into specialized cell types).
In multicellular organisms, stem cells are undifferentiated or partially differentiated cells that can both proliferate indefinitely and generate multiple specialized cell types. They are the earliest cells in a cell lineage and are distinguished from progenitor/precursor cells by their ability to self-renew over many cycles. Stem cells occur in embryonic and adult organisms, but their properties differ: embryonic stem cells are typically pluripotent, while adult stem cells are often multipotent or unipotent and are found in specific tissue microenvironments called niches. Within cell lineages, stem cells provide the foundational branching point from which differentiated descendants arise. Their role is maintained through regulated self-renewal and controlled differentiation, commonly involving symmetric division (producing two stem-like daughters) or asymmetric division (producing one stem cell and one progenitor with limited self-renewal). Lineage analysis tracks how cells relate across successive divisions, helping researchers understand stem cell effectiveness, lifespan, and the genetic pathways that regulate differentiation. Overall, stem cells are central to development and tissue maintenance by replenishing lost or damaged cell types.
Stem cells are defined by self-renewal (indefinite proliferation while maintaining an undifferentiated state) and potency (capacity to differentiate into specialized cell types).
Stem cells are the earliest cells in a cell lineage and can be embryonic (often pluripotent) or adult (often multipotent/unipotent) depending on developmental stage.
Stem cell lineage maintenance occurs through symmetric and asymmetric divisions, and differentiation is influenced by leaving a stem-cell niche or losing niche signals.
Cell lineage studies use division relationships to map developmental pathways and evaluate stem cell behavior, including effectiveness and lifespan.
The sequence of related cells produced through successive cell divisions, showing how one cell gives rise to descendants over time.
The ability of a stem cell to undergo many rounds of division while preserving its undifferentiated stem-cell state.
The differentiation capacity of a stem cell, ranging from totipotent/pluripotent to multipotent or unipotent.
A potency state in which a stem cell can differentiate into nearly all cell types derived from the three germ layers (but not extraembryonic tissues like the placenta).
A potency state in which a stem cell can differentiate into multiple related cell types within a limited family.
A potency state in which a stem cell can produce only one cell type, while still retaining self-renewal ability.
A specialized microenvironment in adult tissues that provides signals to regulate stem cell maintenance and differentiation.
A stem cell division that produces two daughter cells with stem-cell properties.
A stem cell division that yields one stem cell and one progenitor cell with limited self-renewal potential.
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