In infectious disease modelling, a who acquires infection from whom <unk>  is a matrix that describes the rate of transmission of infection between different groups in a population, such as people of different ages. Used with an SIR model, the entries of the<unk>  can be used to calculate the basic reproduction number using the next generation operator approach.
WAIFW matrix
Matrix-core
Kozak consensus sequence
Reynolds' pentad
Nuclear bag fiber
Quad helix
Contour threads
Suzuki frame