Atto 655 (Figure 1) can be used as an alternative of Alexa Fluor®660.

Figure 1. Structure of 5'-Atto 655 (R = sequence).
metabion offers the Atto 655 modification in its DNA portfolio:
Suggestions
Atto 655 (Figure 1) can be used as an alternative of Alexa Fluor®660.
Figure 1. Structure of 5'-Atto 655 (R = sequence).
metabion offers the Atto 655 modification in its DNA portfolio: