rstitial mesenchymal cells), which led the authors to adopt a Y-shaped tree model (<i>i.e.</i>, a star tree with three arms) to explain the data. However, it is difficult to quantify the reliability of this tree model and to confidently predict that the best-fit tree consists of three principal paths.</p>
</div>
</div>
<div class="section level2">
<h2 id="quantitative-trajectory-inference-with-treefit">3. Quantitative trajectory inference with Treefit<a class="anchor" aria-label="anchor" href="#quantitative