CR4 may refer to:
Science and technology
*
Complement receptor 4
Integrin alphaXbeta2 (p150,95, CR4) is a complement receptor composed of CD11c and CD18.
External links
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Immune system
Integrins
{{immunology-stub ...
, a
complement receptor
A complement receptor is a membrane-bound receptor belonging to the complement system, which is part of the innate immune system. Complement receptors bind effector protein fragments that are produced in response to antigen-antibody complexes or ...
in the immune system
* CR4, a
control register
A control register is a processor register which changes or controls the general behavior of a CPU or other digital device. Common tasks performed by control registers include interrupt control, switching the addressing mode, paging control, ...
in the x86 CPU architecture
* 100GBASE-CR4 and 40GBASE-CR4, in
100 Gigabit Ethernet and 40 Gigabit Ethernet
Other uses
* CR4, four-firm
concentration ratio
In economics, concentration ratios are used to quantify market concentration and are based on companies' market shares in a given industry. Market share can be defined as a firm's proportion of total sales in an industry, a firm's market capita ...
, a measure of market concentration in economics
* CR4, a postcode district in the
CR postcode area
The CR postcode area, also known as the Croydon postcode area, is a group of eight postcode districts in England, within ten post towns. These cover parts of southern Greater London and north-east Surrey.
The main sorting office is in Croydon, ...
in England
*
Pasir Ris East MRT station
Pasir Ris East MRT station is a future underground Mass Rapid Transit station on the Cross Island MRT line located in Pasir Ris
Pasir Ris is a planning area and residential town located in the East Region of Singapore. It is bordered b ...
(CR4), an upcoming MRT station on the Cross Island Line in Singapore
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