Juan Rudy Enriquez, Texas prisoner number 227122, appeals, pro se, the Fed. R. Civ. P. 12(b)(6) dismissal of his 42 U.S.C. § 1983 action by which Enriquez challenged Texas Board of Pardons and Paroles’ procedures on due process and equal protection grounds. (Enriquez’ motion for appointment of counsel is DENIED.)

A Rule 12(b)(6) dismissal is reviewed de novo. E.g., McGrew v. Texas Board of Pardons & Paroles, 47 F.3d 158, 160 (5th Cir. 1995). As a Texas prisoner, Enriquez is precluded from complaining that the procedures used to determine his parole eligibility were unconstitutional. See Johnson v. Rodriguez, 110 F.3d 299, 308 (5th Cir.), cert. denied, 522 U.S. 995, 118 S.Ct. 559, 139 L.Ed.2d 400 (1997). Cook v. Texas Dep’t of Criminal Justice Transitional Planning Dep’t, 37 F.3d 166 (5th Cir. 1994), did not call into question the long-standing rule later iterated in Johnson that Texas prisoners have no protected liberty interest in parole and, therefore, cannot challenge the constitutionality of review proce *488 dures attendant to parole decisions; the issue was not raised in that case.

The absence of a protected liberty interest in release on parole does not, however, preclude an equal protection claim. Sandin v. Conner, 515 U.S. 472, 487 n. 11, 115 S.Ct. 2293, 132 L.Ed.2d 418 (1995). Nevertheless, Enriquez does not raise the equal protection claim in his brief; that issue is abandoned. E.g., Yohey v. Collins, 985 F.2d 222, 224-25 (5th Cir. 1993).

AFFIRMED; MOTION DENIED