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Table 1 Qualitative cycles of interest where →* describes a sequence of discrete transitions and where the first variable is M P and the second variable is M T (other variables are not specified and can take any value).

From: Hybrid modeling of biological networks: mixing temporal and qualitative biological properties

Cycle ID Qualitative Cycle Necessary constraints
1 (+, +, ...) →* (+, -, ...) →* (-, -, ...) →* (+, -, ...) →* (+, +, ...)
2 (+, +, ...) →* (-, +, ...) →* (-, -, ...) →* (+, -, ...) →* (+, +, ...)
3 (+, +, ...) →* (+, -, ...) →* (-, -, ...) →* (-, +, ...) →* (+, +, ...)
4 (+, +, ...) →* (-, +, ...) →* (-, -, ...) →* (-, +, ...) →* (+, +, ...)