Reaction-diffusion parallel growing method

I've created many types of reaction-diffusion patterns using different parameters for death and feed rates etc. Working with them on Ready by GollyGang (a simple C++ software that can grow the patterns based on parameters and code) However, they all end up in curly, combined, maze-like forms, or dots etc. Like this:

What I want to achieve though is more like parallel, straight lines that occasionaly combine looking like veins or growing branches; see the image below:

I've searched for any formula for this but couldn't find any. What parameters should I play with?