to clarify the mechanism by which type i procollagen gene transcription is abolished in transformed cells , the methylation patterns of the alpha 1 ( i ) and alpha 2 procollagen genes in normal and sv40-transformed fibroblasts were compared , using the chicken alpha 1 ( i ) and alpha 2 procollagen-cdna clones as probes .
C0007634
cells
C0016030
fibroblasts