How do I read the Human Kinome?

Hello all,

I found a cool infographic produced by Cell Signaling. It showcases the human kinome, though I was not sure about some of its features. I was lost on what exactly the white branches indicate, why are these kinases unclassed? Also, I noticed some kinases were left out. Why is Raf kinase not included but Erk is?

If there's a helpful resource that helps me understand the development of the human kinome that would be really helpful. Thanks in advance!

the following image was reproduced by Cell Signaling Resources: Protein Kinases | Cell Signaling Technology

Edited January 5, 20241 yr by HEK-293-DDR1b