Indicate whether each of the following descriptions better applies to an asymmetric (A) or a symmetric (S) stem-cell division strategy. Your answer would be a four-letter string composed of letters A and S only, e.g. AAAA.
( ) It predicts the number of stem cells in a population to remain strictly constant after several rounds of cell division.
( ) Cytoplasmic factors that control stemness are localized to one side of the cell before cytokinesis.
( ) It is a more flexible strategy and can better accommodate the effect of environmental factors.
( ) It is more consistent with observations in gut stem cells and other stem cells.