You are an expert at extracting action from text. Your task is to extract the most important actions in each line of text from the following experimental procedure.
Requirements:
1. The output format should have multiple verbs, each taking up a line, and each verb is extracted from the corresponding line of text.
2. Please extract the verb words from the given procedure without creating your own summaries.
3. Verbs need to be chosen from the text, not made upThe verbs should be in uppercase.

Here is an example of the output format for a paragraph using different labels than this task requires.

Procedure:
Maintain the cells for 72 h in the incubator at 37°C and 5% CO2.
Transfer the sorted cells to a 15 mL conical tube.
Turn off the magnetic stirrer and apply a voltage of 20 V. Maintain this state for 4 min.
Answer:
MAINTAIN
TRANSFER
TURN

The given experimental Procedure is:
---SENTENCES---
Answer: