SLC7A5 and neoplasm: Conversely, a similar experiment performed with 4T1 cells bearing doxycycline-inducible wtp53 led to reduction in tumor volume upon wtp53 induction, while no significant variation of the expression of SSP enzymes and AA transporters was detected, except for a slight increase of SLC7A5 and SLC3A2 mRNA levels (Suppl.