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A T cell is a type of lymphocyte. T cells are one of the important white blood cells of the immune system and play a central role in the adaptive immune response. T cells can be distinguished from other lymphocytes by the presence of a T-cell receptor (TCR) on their cell surface.
T cells are born from hematopoietic stem cells, found in the bone marrow. Developing T cells then migrate to the thymus gland to develop (or mature). T cells derive their name from the thymus. After migration to the thymus, the precursor cells mature into several distinct types of T cells. T cell differentiation also continues after they have left the thymus. Groups of specific, differentiated T cell subtypes have a variety of important functions in controlling and shaping the immune response.
One of these functions is immune-mediated cell death, and it is carried out by two major subtypes: CD8+ "killer" and CD4+ "helper" T cells. (These are named for the presence of the cell surface proteins CD8 or CD4.) CD8+ T cells, also known as "killer T cells", are cytotoxic – this means that they are able to directly kill virus-infected cells, as well as cancer cells. CD8+ T cells are also able to use small signaling proteins, known as cytokines, to recruit other types of cells when mounting an immune response. A different population of T cells, the CD4+ T cells, function as "helper cells". Unlike CD8+ killer T cells, the CD4+ helper T (TH) cells function by further activating memory B cells and cytotoxic T cells, which leads to a larger immune response. The specific adaptive immune response regulated by the TH cell depends on its subtype, which is distinguished by the types of cytokines they secrete.Regulatory T cells are yet another distinct population of T cells that provide the critical mechanism of tolerance, whereby immune cells are able to distinguish invading cells from "self". This prevents immune cells from inappropriately reacting against one's own cells, known as an "autoimmune" response. For this reason, these regulatory T cells have also been called "suppressor" T cells. These same regulatory T cells can also be co-opted by cancer cells to prevent the recognition of, and an immune response against, tumor cells.

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  1. S

    Help Pa help po sana sa theo framework T_T

    Pa help naman po sino po kaya ditong may alam ng any example or magagamit as theoretical framework po, about sa research na "financial and accounting knowledge" po sana. For tom na po kase and wala po ako mahanap na magagamit na theory for correlating the two variables. TYIA na po agad T_T
  2. J

    WASH OUT NA NAMAN KAMI T_T

    Mga Madam/Sir, Baka po pwede humingi ng kaunting tulong sa inyo. any amount po ma-appreciate na po namin ng pamilya ko .. nasunugan po kasi kami kahapon sa Recto po. Back to Zero po kami..Wala po kaming naisalba dahil mabilis na kumalat ang apoy .. kakapalan ko na po mukha ko mga sir/mam...
  3. Z

    Kulay Ube (T_T)

    Happy naman naging kulay ube na...Salamat Sa Lahat...And Yes Nakapasok Nako Dun Sa lungga ng mga malalakas...pero Hanggang basa nalang talaga ako...Master Admin Boss D. Salamat 🤟 Ipagpatuloy ko maging mabait at maging mabuting membro dito sa PHC...Salamat Sa Mga Sumusunod Na Member Na Nakausap...
  4. A

    Closed Dumating na load ni paymaya bigyan nyoko t_t

    Guys dumating na yung 100 ni paymaya sa tropa ko. Share ko lang:). Sa maraming niregister na sim baka nmn kahit pang gs lang hehehe.
  5. J

    Closed Shadowsocks server ( 5 hrs expiration t_t)

    SERVER: 31.SHADOW.TUNNELZ.ONLINE PORT: 36637 PASSWORD :1234567890 ENCRYPTION: AES-256-CFB
  6. C

    Closed Help!!! pa-unlock po ng sim network ko t_t

    Hi Pa help din po mag papaunlock sim network ako here are the details, Alcatel One Touch 7047E IMEI: 864356021220505 (sim1) <------ To be Unlock 864356021220521 (sim2) <------ Unlock already PRD: 7047E-2ASPPH1 (Sun Cellular) Thank you very much
  7. Y

    Closed .help

    Bkit ganun? journey man nk pero di padin established?? tulong nmn po..
  8. D

    Closed openvpn using pc

    mga boss katay napo ba si openvpn sa pc inde napo kasi maka connect e mapa modem na sim base or mapa usb syick salamat po
  9. A

    Closed pa share naman po ng biyaya

    pa ambon naman po ng konting biyayang mac add T_T salamat po sa makaka bigay
  10. K

    Help Pa help sa nokia x2-01 sino may alam...

    Panu po magsubscribe sa packet data? Di kasi ako makagamit ng YøùTùbé using FUN BUNDLE??? Pahelp naman po kung sino may alam jan thanks!!!!!!
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