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?