although the actions of beta-c and ctx are similar to those of retinoids in the 10t1/2 system , we suggest that the carotenoids act via a different mechanism , since ctx can not be converted to active retinoids in mammalian cells , and there is no evidence that 10t1/2 cells can convert beta-c to vitamin a .
C0007271
carotenoids
C0035339
retinoids