The phrase "a small category of" is correct and usable in written English.
It can be used when referring to a limited or specific group within a larger classification.
Example: "In the study of animal behavior, a small category of species exhibits unique social structures."
Alternatives: "a limited group of" or "a minor subset of".
In England its use was limited by statute to a small category of cases.
"Facebook is in a small category of companies to have changed the world... which changed the way people used computers".
In the years since, the Hermitage has gradually revealed more holdings; it has published catalogs and joined negotiations over the return of a small category of items.
These would be a small category of detainees who the government determines are a significant security threat but cannot be tried because of the lack of usable evidence.
A ministry official decided that the German liners needed a small category of their own and would be named after rivers.
"What we're saying is there may be a small category of weapons that we think really can drastically increase the incidence of gun violence, and we already have some restrictions," he said.
However, experts who have studied the DoJ policy sent to US attorneys say the measure remains quite narrow, applying only to a smaller category of offenders with no history of violence or links to drug gangs.
Some Republicans are pushing what they say is a more conservative version of the Dream Act, called the Recognizing America's Children Act, or RAC Act, which would offer a path to citizenship to a smaller category of Dreamers. .
Observing evolutionarily conserved seed matching sites for a relatively small category of miRNAs is an indication that these miRNAs may be involved in the regulation of progenitor maintenance genes.
Categories required at least two signals to be counted as enriched to remove the possibility of a small category being deemed significantly enriched based on one signal.
