The phrase "a special function in" is correct and usable in written English.
It can be used to describe a unique role or purpose that something serves within a particular context or system.
Example: "The enzyme plays a special function in the metabolic process, facilitating the breakdown of nutrients."
Alternatives: "a unique role in" or "a specific purpose in".
HC-Pro protein of PVY has a special function in cleaving the polyprotein into functional viral proteins.
Toys have a special function in therapy, so they had to look for specific kinds of toys.
The designer had a special function; in addition to designing the sets and costumes, he also produced, for early rehearsal purposes, a series of sketches of key moments in the action.
In other cases the local area needs a special function in order to mimic the exact solution there.
It has a special function in the internationalization and openness of the economy and the components of the NIS.
However, there was no significant difference in the number of spikelets between AP3 and AP8, which indicated that these four tandem alanine repeats in the first exon did not have a special function in spikelet development.
A special function space in which the basis functions are orthogonal in pairs is used.
The nonlinear behaviour of the reactor is analysed by using a special function developed in the present paper.
A variant of such operators (integral transforms) was introduced by Marichev [13] as Mellin type convolution operators with a special function (F_{3}(cdot)) in the kernel.
To monitor objectively the subjects' level of alertness a special function was edited in Matlab using Cogent 2000 (version 1.24) to present fifty pairs of either identical or almost identical (four identical digits, one different) five digit figures (Arial size 100), on the same computer screen described above.
This expression incorporates the Exponential Integral, a special function known to arise in the analysis and design of ultrafiltration systems.
