CD20 (medicine) and letter 1, noun (oh)

CD20 (medicine)

CD20
<immunology> Unglycosylated phosphoproteins expressed only on B-cells. They are regulators of transmembrane calcium conductance and thought to play a role in B-cell activation and proliferation.

[Date: 1200-1300; Language: Old French; Origin: lettre, from Latin littera]
a written or printed message that is usually put in an envelope and sent by mail
letter from/to
::I got a long letter from Melanie today.
::Bart's Writing a letter to his parents.
post a letter BrE /mail a letter AmE
::Could you post this letter for me?
a letter of thanks/introduction/complaint etc
::Julie received a letter of apology from the hospital.
::a business letter
-see also chain letter , covering letter , letter of credit , open letter , thank-you letter at thank-you (2)
a sign in Writing or printing that represents a speech sound
::There are 26 letters in the English alphabet.
::Fill in the form in capital letters (=written in their large form) .
-see also block letters
to the letter
paying exact attention to the details of something
::I followed the instructions to the letter, but it still wouldn't work.
the letter of the law
the exact words of a law or agreement rather than the intended or General meaning
::employees who stick to the letter of the law in their contracts
-see also the spirit of the law at spirit 1 (11)
AmE a large cloth letter that you sew onto a jacket, given as a reward for playing in a school or college Sports team
::Mark got a letter in Soccer.
English/American/German etc letters [plural] formal the study of the literature of a particular country or language
::a major figure in English letters
-see also dead letter , man of letters

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