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C-C chemokine receptor type 5, also known as CCR5 or CD195, is a protein on the surface of white blood cells that is involved in the immune system as it acts as a receptor for chemokines.

This is the process by which T cells are attracted to specific tissue and organ targets.

A third hypothesis relies on the north-to-south gradient of allele frequency in Europe which shows that the highest allele frequency occurred in Nordic regions such as Iceland, Norway and Sweden and lowest allele frequency in the south.

Because the Vikings historically occupied these countries, it may be possible that the allele spread throughout Europe was due to the Viking dispersal in the 8th to 10th century.

Certain populations have inherited the Delta 32 mutation resulting in the genetic deletion of a portion of the CCR5 gene.Therefore, given the average age of roughly 1000 years for the CCR5-Δ32 allele, it can be established that HIV-1 did not exert selection pressure on the human population for long enough to achieve the current frequencies.Hence, other pathogens have been suggested agents of positive selection for CCR5 Δ32.This bind results in gp41, the other protein product of gp160, to be released from its metastable conformation and insert itself into the membrane of the host cell.Although it hasn't been finalized as a proven theory yet, binding of gp120-CCR5 involves two crucial steps: 1) The tyrosine sulfated amino terminus of this co-receptor is an "essential determinant" of binding to gp120 (as stated previously) 2) Following step 1., there must be reciprocal action (synergy, intercommunication) between gp120 and the CCR5 transmembrane domains These experimental drugs include PRO140 (Cyto Dyn), Vicriviroc (Phase III trials were cancelled in July 2010) (Schering Plough), Aplaviroc (GW-873140) (Glaxo Smith Kline) and Maraviroc (UK-427857) (Pfizer).

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    For the original related TV series about teenage pregnancy, see 16 and Pregnant.