biology

KLK13

KLK13 is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand KLK13 rather than just read about it. In short: Kallikrein-13 is a protein that in humans is encoded by the KLK13 gene. Function Kallikreins are a subgroup of serine proteases having diverse physiological functions.

Key takeaways

KLK13 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect KLK13 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of KLK13 from memory before moving on to harder problems.

Reference excerpt

Kallikrein-13 is a protein that in humans is encoded by the KLK13 gene.

Function Kallikreins are a subgroup of serine proteases having diverse physiological functions. As of 2022, the precise physiological functions of Kallikrein 13 remain unknown. It may play a role in the defense of the upper digestive apparatus, in extracellular matrix degradation, in tissue remodelling, and in the male reproductive organs. This gene is one of the fifteen kallikrein subfamily members located in a cluster on chromosome 19. Expression of this gene is regulated by steroid hormones and may be useful as a marker for breast cancer. An additional transcript variant has been identified, but its full length sequence has not been determined. Kallikrein-13 serves as a priming protease during infection by the human coronavirus HKU1. Many kallikreins are implicated in carcinogenesis and some have potential as novel cancer and other disease biomarkers.

References

Illustrations

Worked examples

Example 1 — a first encounter with KLK13

Start with the simplest possible case. Write down what KLK13 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to KLK13 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about KLK13 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of KLK13

In research: KLK13 appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses KLK13 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: KLK13 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 19, Human chromosome 19 gene stubs, so understanding it makes those chapters shorter.
In everyday life: Look for KLK13 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study KLK13 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what KLK13 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain KLK13 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is KLK13 in simple terms?

Kallikrein-13 is a protein that in humans is encoded by the KLK13 gene. Function Kallikreins are a subgroup of serine proteases having diverse physiological functions.

Why does KLK13 matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study KLK13?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on KLK13.