# Page Not Found

The URL `part-iii.-case-studies/case-study-1.exrna-seq/1.4.normalization-issues` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [1.4 Normalization Issues](https://lulab1.gitbook.io/training/archive/archive-2019/part-iii.-case-studies/case-study-1.exrna-seq/1.4.normalization-issues.md)
- [2.2 Matrix Processing](https://lulab1.gitbook.io/training/archive/archive-2019/part-iii.-case-studies/case-study-2.exseek/2.2.normalization.md)
- [1.1 Mapping, Annotation and QC](https://lulab1.gitbook.io/training/archive/archive-2019/part-iii.-case-studies/case-study-1.exrna-seq/1.1.mapping-annotation-and-qc.md)
- [1.2 Expression Matrix](https://lulab1.gitbook.io/training/archive/archive-2019/part-iii.-case-studies/case-study-1.exrna-seq/1.2.expression-matrix.md)
- [1.3.Differential Expression](https://lulab1.gitbook.io/training/archive/archive-2019/part-iii.-case-studies/case-study-1.exrna-seq/1.3.differential-expression.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://lulab1.gitbook.io/training/archive/archive-2019/part-iii.-case-studies/case-study-1.exrna-seq/1.4.normalization-issues.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://lulab1.gitbook.io/training/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://lulab1.gitbook.io/training/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/training/archive/archive-2019/part-iii.-case-studies/case-study-1.exrna-seq/1.4.normalization-issues.md`).

You may also use `Accept: text/markdown` header for content negotiation.