The undersigned, a
holder of shares of Sorrento Therapeutics, Inc., a Delaware
corporation (“ Sorrento ”), and/or QuikByte
Software, Inc., a Colorado corporation (together with its
successors, “ Parent ”), will hold shares of
common stock, $0.0001 par value, of Parent (“ Parent
Shares ”) after the transactions contemplated by that
certain Merger Agreement, dated as of July 14, 2009 by and
among Sorrento, Parent, Sorrento Merger Corp., Inc., a Delaware
corporation, Stephen Zaniboni, an individual as the
Stockholders’ Agent thereunder, and Glenn Halpryn, an
individual as Parent Representative thereunder, as amended (the
“ Merger Agreement ”). For good and valuable
consideration, the undersigned hereby irrevocably agrees that
following the closing of the merger contemplated under the Merger
Agreement (the “ Merger ”), the undersigned will
not, directly or indirectly, (1) offer for sale, sell, pledge
or otherwise dispose of (or enter into any transaction or device
that is designed to, or could be expected to, result in the
disposition by any person at any time in the future of) any Parent
Share, including, Parent Shares that may be deemed to be
beneficially owned by the undersigned in accordance with the rules
and regulations of the United States Securities and Exchange
Commission and Parent Shares that may be issued upon exercise of
any options or warrants, or securities convertible into or
exercisable or exchangeable for Parent Shares, (2) enter into
any swap or other derivatives transaction that transfers to
another, in whole or in part, any of the economic benefits or risks
of ownership of Parent Shares, whether a
