---
license: mit
library_name: pyaging
tags:
- pyaging
- aging-clock
- biology
- dna-methylation
---

# stemtoc

Relative mitotic-age counter based on the 95th percentile across 371 in-vivo-filtered mitotic CpGs.

| | |
|---|---|
| **Predicts** | mitotic age |
| **Species** | Homo sapiens |
| **Tissue** | multi-tissue, cultured human cells, whole blood |
| **Data type** | DNA methylation |
| **Model type** | 95th-percentile methylation aggregation |
| **Year** | 2024 |

## Use with pyaging

```python
import pyaging as pya

pya.pred.predict_age(adata, ["stemtoc"])
```

Browse every clock in the [pyaging Clock Catalogue](https://pyaging.readthedocs.io).

## Citation

Zhu, Tianlei, et al. "An improved epigenetic counter to track mitotic age in cells." Nature Communications 15 (2024): 4211.

https://doi.org/10.1038/s41467-024-48649-8