Functional clustering of differentially expressed genes of hMSC-OP, hMSC-old and hMSC-senescent when compared to hMSC-C.

arrows pointing downward = at least 2fold reduced expression in comparison to hMSC-C; arrows pointing upward = at least 2fold enhanced expression in comparison to hMSC-C;
W = gene associated with WNT signaling;
B = gene associated with BMP signaling;
* = probesets that refer to the gene are not identical in the indicated comparisons.