class restriction

class restriction

The requirement of certain T lymphocytes for the presence of either class I or class II major histocompatibility complex markers on antigen-presenting cells. These markers enable the T cells to recognize and respond to foreign antigens. CD4+ T cells require class II antigens and CD8+ T cells require class I antigens. Class restriction is a type of clonal restriction.
See: antigen-presenting cell; clonal restriction
References in periodicals archive ?
H as suitable technologies, systematic support and the time line for implementation including the phasing of implementation and vehicle class restrictions over the medium term (1 to 10years).
Michael looked into this three years ago, designing and testing a new rig and sail set up, but came to the conclusion after a lot of effort and testing that it couldn't work due to the class restrictions, which say the masts have to be aluminium or fibre glass - "not carbon".
class restrictions (CR) {Restriction}, -- property restrictions (PR) {rdfs:domain, rdfs:range}, -- equalities (E) {differentFrom, distinctMembers, equivalentClass, equivalentProperty, sameAs}, -- class axioms (CA) {oneOf, dataRange, disjointWith}, -- class expressions (CE) {complementOf, intersectionOf, unionOf}.
For instance, Spear claims that "For Catholic spectators, without chronological, educational or class restrictions, Reni's paintings should convey a message that is familiar from childhood and is thoroughly promising because they personify sanctifying grace.
Upgrades: To determine if the fare purchased with this discount allows the use of an upgrade certificate, refer to the terms, conditions and booking class restrictions associated with the upgrade type you are using.
Targeting a market gap frequently encountered by its independent brokers, PointSure has broadened its WC capabilities by offering standard-market coverage for risks often neglected due to size and class restrictions.
Designated users are able to override user class restrictions in order to reach an otherwise protected end point.
These include support for specific vendor contract terms such as fare and class restrictions, pre-negotiated percent discounts, flight connection and airport defaults, and dollar-off and net rate terms.