however , the sulfated proteoglycans synthesized by presumptive chondroblasts or by dedifferentiated or bromodeoxyuridine-suppressed chondroblasts can not be dintinguished by these techniques from those synthesized by ( i ) blastodisc cells , ( ii ) fibroblasts , ( iii ) spinal cord cells , or ( iv ) skeletal , cardiac , or smooth muscle cells .
C0016030
fibroblasts
C0007634
cells