APC2 and neoplasm: We assume a b23·APC2 efflux rate of APCs from blood to tumor.6\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document} $$\begin{array}{@{}rcl@{}} {}\frac{d \text{APC}_{2}}{dt}&=&r_{2}\cdot \text{APC}_{2}\cdot \bigg(1-\frac{\text{APC}_{2}}{K}\bigg)-b_{23}\cdot \text{APC}_{2} \end{array} $$ \end{document}dAPC2dt=r2·APC2·1−APC2K−b23·APC2