How to only get certain parts of an Excel Spread using readcell?

What I have so far is:

M = readcell('quiz_results.xlsx');

answerKey = M('G2:W2');

When I run this, I get a 1x5 cell, and when I open that, it says "1x1 missing". Why is it doing this and what would fix this? G2:W2 on the Excel Spreadsheet are letters: D B C B A C B D D B B A B B A D C (like for an answer key) if that makes a difference. Thank you!

Answer 1

[Ken Atwell]

Trying using the 'Range' option with readcell.