By . Elliott Bretland for MailOnline . Follow @@EllBretland . Arsenal Under 21s remain unbeaten after drawing 1-1 at home to Derby County on Thursday evening. The young Gunners took the lead four minutes into the second half through winger Ainsley Maitland-Niles. Having missed an open goal shortly before Arsenal's opener, Derby levelled on 81 minutes. Opener: Arsenal winger Ainsley Maitland-Niles celebrates after putting the Gunners ahead against Derby . Midfield battle: Daniel Crowley looks forward as Derby's Tom Naylor watches on . Kieron Freeman was tripped in the box by substitute Alex Iwobi and Alefe Santos scored from the spot. The hosts had chances late on through Maitland-Niles and Chuba Akpom but were unable to find an elusive winning goal. Aerial duel: Arsenal's Glen Kamara is beaten in the air by Derby's Kwame Thomas .
Arsenal Under 21s maintain unbeaten after 1-1 draw with Derby . Young Gunners took lead through Ainsley Maitland-Niles . Rams equalised late on from penalty spot .