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So I'm trying to understand this phrase:

Unlike other endocytic pathways, macropinocytosis is acutely induced by growth factors

From the following paper

The 4 endocytic pathways I know of are / distinguishing traits:

1) Endocytosis / can or cannot be receptor mediated?

2) Autophagy / occurs spontaneously because its self degradation?

3) pinocytosis / type of endocytosis that isn't receptor mediated, and just constantly forms endocytic vesicles?

4) macropinocytosis / uses growth factors

Do my attempted reasons correctly identify and differentiate macropinocytosis from the other three endocytic pathways that the authors are describing?

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