Table 1. Source, clone, and dilution of antibodies.
| Antibody | Company | Clone | Dilution |
| serine/glycine metabolism related proteins | |||
| PHGDH | Abcam, Cambridge, UK | Polyclonal | 1∶100 |
| PSAT1 | Abcam, Cambridge, UK | Polyclonal | 1∶100 |
| PSPH | Abcam, Cambridge, UK | Polyclonal | 1∶100 |
| SHMT | Abcam, Cambridge, UK | Polyclonal | 1∶100 |
| GLDC | Abcam, Cambridge, UK | Polyclonal | 1∶100 |
| molecular subtype related proteins | |||
| ER | Thermo Scientific, San Siego, CA, USA | SP1 | 1∶100 |
| PR | DAKO, Glostrup, Denmark | PgR | 1∶50 |
| HER-2 | DAKO, Glostrup, Denmark | Polyclonal | 1∶1500 |
| Ki-67 | Abcam, Cambridge, UK | MIB | 1∶1000 |