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Fig. 4. Expression levels for each probe within categories of population. The means and standard deviations (bars on the left) of corrected (standardized against total cDNA) expression levels were calculated and subjected to the Welch t-test for statistically significant changes as cells differentiate (table on the right). Categories were defined as COLL-I-/ALP- colonies, COLL-I+/ALP- colonies, COLL-I+/ALP+ colonies, and OB colonies (COLL-I+/ALP+/BSP+/OCN+) (nt, not testable).