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#confluency

2 public questions tagged with this topic.

Animal Tissue Culture 2

Cells are usually passaged when confluency reaches:

Timing of passaging is critical for maintaining healthy proliferative populations. Majority of mammalian fibroblast and epithelial lines including HeLa, HEK293, CHO are optimally split when confluency reaches 70-80%, representing late logarithmic phase immediately preceding plateau. At this density, cells remain highly viable, mitotically active, with robust integrin signaling, active MAPK pathways, and minimal cell cycle arrest. Splitting earlier at 20-30% wastes expensive reagents and extends lag period for reattachment, while allowing 100% confluence triggers contact inhibition mediated by

Ref: Freshney Ch.14 Confluence 70-80% late log phase ideal; Alberts MBoC contact inhibition Hippo pathway regulation of proliferation.

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Basic Applied Biology

Cells are passaged optimally at confluency of:

Subculturing or passaging maintains exponential growth, prevents phenotypic drift associated with contact inhibition, nutrient exhaustion, waste accumulation and extracellular matrix overproduction. For adherent animal cells optimal confluency for passage ranges 70 to 80 percent, stage where monolayer covers majority of flask surface but retains intercellular gaps, active mitosis indicated by refractile rounded mitotic figures, high viability exceeding 95 percent via trypan blue exclusion, and low expression of cyclin-dependent kinase inhibitors p27KIP1 and p21 that accumulate in quiescence. A

Ref: Freshney Ch subculture guidelines; Alberts Ch cell cycle contact inhibition mechanisms; ATCC passaging standard operating procedures.

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