Escaping curly bracket

Hello,

having echo "<style>#NM_ck_run".{sc_seq_register}." {display:none;}</style>"; for hide checkbox on row X in the onRecord of a grid, does not consider the {display:none;} as a CSS code but probably as a variable. In the HTML i just get <style>#NM_ck_run1 </style> and so on for each row in the grid.
How can I escape the curly bracket in order to echo also the CSS content?

Thanks guys