12 C.F.R. § 208.45
(2) Provisions applicable to undercapitalized, significantly undercapitalized, and critically undercapitalized banks. Immediately upon receiving notice or being deemed to have notice, as provided in § 208.42 or § 208.44, that the bank is undercapitalized, significantly undercapitalized, or critically undercapitalized, the bank shall become subject to the provisions of section 38 of the FDI Act:
(4) Additional provisions applicable to critically undercapitalized banks. In addition to the provisions of section 38 of the FDI Act described in paragraphs (a)(2) and (a)(3) of this section, immediately upon receiving notice or being deemed to have notice, as provided in § 208.32, that the bank is critically undercapitalized, the bank shall become subject to the provisions of section 38 of the FDI Act: