The phrase "are clipped off" is correct and usable in written English.
It can be used to describe something that has been cut or removed from a larger whole, often in a physical or metaphorical sense.
Example: "The edges of the paper were frayed, and several corners are clipped off, making it difficult to read the text."
Alternatives: "are cut off" or "have been trimmed".
Therefore, the N termini of such peptides are free, and amino acids are clipped off during 10 Edman degradation cycles.
K63-linked ubiquitin accumulates on Rap80 at the DSB foci with the concerted effect of RNF8, RNF168, and Ubc13, which are clipped off with the assistance of USP3 and BRCC36 to maintain the G2/M checkpoint.
Second, the last three amino acids of the protein (ie, the -AAX) are clipped off by the metalloprotease ZMP-STE24 and/or RCE1 (Bergo et al 2002; Corrigan et al 2005).
Fourth, the last 15 amino acids of the protein, including the farnesylcysteine methyl ester, are clipped off by ZMPSTE24 and degraded, releasing mature lamin A (Weber et al 1989; Beck et al 1990; Corrigan et al 2005; Young et al 2006).
In general, many identical copies of a single miRNA are clipped off the same strand location of a given pre-miRNA transcript.
The tags could easily be clipped off, transforming the "fac-simile" into an excellent counterfeit.
The foreskin dies from the pressure of the rubber band in a grooved ring, and drops off or is clipped off a week later.
On closer inspection, we saw that their orange stamens had been clipped off to protect any passing white T-shirts from their fatal stain.
Since the width of the slugs is also uniform, when shorter lines are being cast the composing stick is furnished with thick, blank matrices; once cast, the line is clipped off to the proper length.
Yet as soon as the flag, made of 400 yards of fabric, was lowered from the ramparts, pieces were clipped off and given away as souvenirs, significantly reducing its original size, 30 by 42 feet.
The band compresses the foreskin against a plastic ring slipped inside it; the foreskin dies within hours for lack of blood and, after a week, falls off or can be clipped off "like a fingernail," said Tzameret Fuerst, the company's chief executive officer, who compared the process to the stump of an umbilical cord's shriveling up and dropping off a few days after it is clamped.
