Table 6 Possible movements of mRNA expression levels

Case 1

When Genei loses one customer

\(x_{i}^{-} = (x_{1}, \cdots, x_{i} - 1, x_{n})\)

Case 2

When Genei gains one customer

\(x_{i}^{+} = (x_{1}, \cdots, x_{i} + 1, x_{n})\)

Case 3

When Genei loses one customer, while Genej gains one

\(x_{{ij}}^{-+} = (x_{1}, \cdots, x_{i} - 1, x_{i+1}, \cdots, x_{j} + 1, x_{j+1}, \cdots, x_{n})\)

Case4

When both Genei and Genej lose one customer

\(x_{{ij}}^{--} = (x_{1}, \cdots, x_{i} - 1, x_{i+1}, \cdots, x_{j} - 1, x_{j+1}, \cdots, x_{n})\)