Middlebrook 7H11 agar is identical to Middlebrook 7H10 agar, with an addition of pancreatic digest of casein to facilitate the growth of fastidious cultures of M. tuberculosis.
Mycobactin J may also be added to Middlebrook 7H11 agar to allow the recovery of M. genavense.
References
Middlebrook 7H11 Agar Wikipedia(Text) CC BY-SA