BFU-E -derived colonies increase progressively in size , as determined by cell number , from day 7 to day 14 of culture , with the greatest increase in colony size ( 10-fold expansion ) occurring between day 7 and day 10 .
bfu-e -derived colonies increase progressively in size , as determined by cell number , from day 7 to day 14 of culture , with the greatest increase in colony size ( 10-fold expansion ) occurring between day 7 and day 10 .
B-cell_type O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O