Making an arrow expand

Feb 15, 2018

Hi I need help again. I would like to use the embryo drawing as a background and superimpose the drawing of the arrow such that the arrows start appearing at the top of the image and extends on the left and right to encircle the embryo.

I don't think that any of the premade animations allow this, but I suspect that this is something that could be done with States. I am not really clear how to do that ... make many copies of the baseline state, edit the copies to reveal progressively more of the arrow and how to get the states to progressively change ? How to prevent a "choppy" appearance. I would  like something more like a smooth Flash effect.

Thanks for help !

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