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Table 1 Summary of frequency of progenitor activity

From: Anatomical localization of progenitor cells in human breast tissue reveals enrichment of uncommitted cells within immature lobules

Uncultured cells
Progenitor type Progenitor lineage mean ± sd Frequency, number/1000 cells
Adherent progenitors (n = 19)    
Total Both 0.0098 ± 0.0023 9.8/1000
Bi-potent Both 0.002 ± 0.0014 2/1000
Luminal progenitors Luminal 0.0036 ± 0.004 3.6/1000
Basal progenitors Basal 0.0029 ± 0.004 2.9/1000
Non-adherent progenitors    
Mammospheres (n = 19) Both 0.0067 ± 0.00092 6.7/1000
Floating colonies (n = 18) Luminal 0.0048 ± 0.00088 4.8/1000
Structural progenitors (n = 13)    
Total   0.003 ± 0.0006 3/1000
Luminal alveolar progenitor Luminal 0.002 ± 0.003 2/1000
Basal ductal progenitor Basal 0.0009 ± 0.0004 0.9/1000
  1. Average age 34.5 ± 12.6 yrs (mean ± SD).