Great Britain have announced their 22-strong team for the World Relay Championships in the Bahamas on May 2 and 3.
European 4x100m gold medallists Richard Kilty, James Ellington and Danny Talbot are all included in the men's squad.
However, there are no places for Adam Gemili, Chijindu Ujah, Harry Aikines-Aryeetey and James Dasaolu.
Bianca Williams, Ashleigh Nelson, Asha Philip, Anyika Onuora and Jodie Williams have been named in the women's sprint squad, but Dina Asher-Smith and Christine Ohuruogu have missed out.
The top eight teams from the men's and women's 4x100m and 4x400m races will qualify for next year's Olympics in Rio.
Men's 4x100m:
Roy Ejiakuekwu, James Ellington, Richard Kilty, Andy Robertson, Sean Safo-Antwi, Danny Talbot
Women's 4x100m:
Margaret Adeoye, Ashleigh Nelson, Anyika Onuora, Asha Philip, Bianca Williams, Jodie Williams
Men's 4x400m:
George Caddick, Jack Green, Martyn Rooney, Conrad Williams, Delano Williams, Rabah Yousif
Women's 4x400m:
Margaret Adeoye, Seren Bundy-Davies, Eilidh Child, Shana Cox, Kelly Massey, Anyika Onuora
