## Modify components of MSA theme

In this package, there are various powerful parameters to customize the non-data components of MSA plots: i.e. font size, background, sequence names, legends and border. Some parameters can be used to give MSA plots a consistent customized look.

### Characters width

Characters width can be specified by char_width. Default is 0.9.

ggmsa(protein_sequences, start = 320, end = 360, char_width = 0.5)

### Background

If none_bg = TRUE, only show the character but not the colored background..

ggmsa(protein_sequences, start = 320, end = 360, none_bg = TRUE) + theme_void()

### Sequence names

If seq_name = TRUE, the sequence name will be displayed.

ggmsa(protein_sequences, 164, 213, seq_name = TRUE)

### Legend

If show.legend = TRUE, the legend of MSA plot will be displayed.

ggmsa(protein_sequences, 164, 213, font = NULL, show.legend = TRUE)

### Border

Change or set colored block border. if border = NA, the border would be removed.

ggmsa(protein_sequences, 164, 213, font = NULL, border = NA)

Or, modify the border color by assign the color to border, like this： border = "white"

ggmsa(protein_sequences, 164, 213, font = NULL, border = "white")

### Position Highlighted

Specified position can be highlighted but the block colors only assign by ggplot2 automatically.

ggmsa(protein_sequences, 164, 213, posHighligthed = c(185, 190), char_width = 0.5)